相关题目
299、In computer science an array is a data structure consisting of a group of elements that are accessed by indexing.in most programing languages each element has the same data type and the array occupies a contiguous area of storage. Most programming languages have a built-in array data type, although what is called an array in the language documentation is sometimes really an associative array.Conversely, the contiguous storage kind of array discussed here may alternatively be called a vector, list, or table.Some programming languages support array programming ( ) which generalizes operations and functions to work transparently over arrays as they do with scalars, instead of requiring looping over array members. Multi-dimensional arrays are accessed using more than one index:one for each dimension.Arrays can be classified as fixed-sized arrays ( ) whose size cannot change once their storage has been allocated or dynamic arrays, which can be resized.Fixed-size arrays permit efficient random access.They are compact data structures, having a constant memory overhead.And, on CPUs which support caches, sequential iteration over an array has good locality of reference because its elements occupy contiguous memory locations.However, when an array is randomly accessed, for example when probing a hash table, locality of reference may be lost.(3)、When the first element of an array is int, and what type will the second element be?
299、In computer science an array is a data structure consisting of a group of elements that are accessed by indexing.in most programing languages each element has the same data type and the array occupies a contiguous area of storage. Most programming languages have a built-in array data type, although what is called an array in the language documentation is sometimes really an associative array.Conversely, the contiguous storage kind of array discussed here may alternatively be called a vector, list, or table.Some programming languages support array programming ( ) which generalizes operations and functions to work transparently over arrays as they do with scalars, instead of requiring looping over array members. Multi-dimensional arrays are accessed using more than one index:one for each dimension.Arrays can be classified as fixed-sized arrays ( ) whose size cannot change once their storage has been allocated or dynamic arrays, which can be resized.Fixed-size arrays permit efficient random access.They are compact data structures, having a constant memory overhead.And, on CPUs which support caches, sequential iteration over an array has good locality of reference because its elements occupy contiguous memory locations.However, when an array is randomly accessed, for example when probing a hash table, locality of reference may be lost.(2)、Which of the following description of fixed-sized arrays is wrong?
299、In computer science an array is a data structure consisting of a group of elements that are accessed by indexing.in most programing languages each element has the same data type and the array occupies a contiguous area of storage. Most programming languages have a built-in array data type, although what is called an array in the language documentation is sometimes really an associative array.Conversely, the contiguous storage kind of array discussed here may alternatively be called a vector, list, or table.Some programming languages support array programming ( ) which generalizes operations and functions to work transparently over arrays as they do with scalars, instead of requiring looping over array members. Multi-dimensional arrays are accessed using more than one index:one for each dimension.Arrays can be classified as fixed-sized arrays ( ) whose size cannot change once their storage has been allocated or dynamic arrays, which can be resized.Fixed-size arrays permit efficient random access.They are compact data structures, having a constant memory overhead.And, on CPUs which support caches, sequential iteration over an array has good locality of reference because its elements occupy contiguous memory locations.However, when an array is randomly accessed, for example when probing a hash table, locality of reference may be lost.(1)、.If we want to access a Three-dimensional array, how many indexes do we need?
298、Computer networks also use flexible glass fibers to transmit data.Known as an optical fiber, the medium uses light to transport data, The miniature glass fiber is encased in a plastic jacket which allows the fiber to bend without breaking.A transmitter at one end of a fiber uses a light emitting diode ( ) or a laser to send pulses of light down the fiber.A receiver at the other end uses a light sensitive transistor to detect the pulses. Optical fibers have four main advantages over wires.First, because they use light, optical fibers neither cause electrical interference in other cables nor are they susceptible to electrical interference.Second, because glass fibers cab be manufactured to reflect most of the light inward, a fiber can carry a pulse of light much farther than a copper wire can carry a signal.Third, because light can encode more information than electrical signals, an optical fiber can carry more information than a wire.Fourth, unlike electricity, which always requires a pair of wires connected into a complete circuit, light can travel from one computer to another over a single fiber. Despite their advantages, optical fibers do have some disadvantages.First, installing a fiber requires special equipment that polishes the ends to allow light to pass through.Second, if a fiber breaks inside the plastic jacket ( ), finding the location of the problem is difficult.Third, repairing a broken fiber is difficult because special equipment is needed to join two fibers so that light can pass through the joint.(5)、What is the central idea of this short essay?
298、Computer networks also use flexible glass fibers to transmit data.Known as an optical fiber, the medium uses light to transport data, The miniature glass fiber is encased in a plastic jacket which allows the fiber to bend without breaking.A transmitter at one end of a fiber uses a light emitting diode ( ) or a laser to send pulses of light down the fiber.A receiver at the other end uses a light sensitive transistor to detect the pulses. Optical fibers have four main advantages over wires.First, because they use light, optical fibers neither cause electrical interference in other cables nor are they susceptible to electrical interference.Second, because glass fibers cab be manufactured to reflect most of the light inward, a fiber can carry a pulse of light much farther than a copper wire can carry a signal.Third, because light can encode more information than electrical signals, an optical fiber can carry more information than a wire.Fourth, unlike electricity, which always requires a pair of wires connected into a complete circuit, light can travel from one computer to another over a single fiber. Despite their advantages, optical fibers do have some disadvantages.First, installing a fiber requires special equipment that polishes the ends to allow light to pass through.Second, if a fiber breaks inside the plastic jacket ( ), finding the location of the problem is difficult.Third, repairing a broken fiber is difficult because special equipment is needed to join two fibers so that light can pass through the joint.(4)、If we need to transmit a large amount of data, what medium should we choose to transmit the data best?
298、Computer networks also use flexible glass fibers to transmit data.Known as an optical fiber, the medium uses light to transport data, The miniature glass fiber is encased in a plastic jacket which allows the fiber to bend without breaking.A transmitter at one end of a fiber uses a light emitting diode ( ) or a laser to send pulses of light down the fiber.A receiver at the other end uses a light sensitive transistor to detect the pulses. Optical fibers have four main advantages over wires.First, because they use light, optical fibers neither cause electrical interference in other cables nor are they susceptible to electrical interference.Second, because glass fibers cab be manufactured to reflect most of the light inward, a fiber can carry a pulse of light much farther than a copper wire can carry a signal.Third, because light can encode more information than electrical signals, an optical fiber can carry more information than a wire.Fourth, unlike electricity, which always requires a pair of wires connected into a complete circuit, light can travel from one computer to another over a single fiber. Despite their advantages, optical fibers do have some disadvantages.First, installing a fiber requires special equipment that polishes the ends to allow light to pass through.Second, if a fiber breaks inside the plastic jacket ( ), finding the location of the problem is difficult.Third, repairing a broken fiber is difficult because special equipment is needed to join two fibers so that light can pass through the joint.(3)、Which one is not the advantages of optical fiber?
298、Computer networks also use flexible glass fibers to transmit data.Known as an optical fiber, the medium uses light to transport data, The miniature glass fiber is encased in a plastic jacket which allows the fiber to bend without breaking.A transmitter at one end of a fiber uses a light emitting diode ( ) or a laser to send pulses of light down the fiber.A receiver at the other end uses a light sensitive transistor to detect the pulses. Optical fibers have four main advantages over wires.First, because they use light, optical fibers neither cause electrical interference in other cables nor are they susceptible to electrical interference.Second, because glass fibers cab be manufactured to reflect most of the light inward, a fiber can carry a pulse of light much farther than a copper wire can carry a signal.Third, because light can encode more information than electrical signals, an optical fiber can carry more information than a wire.Fourth, unlike electricity, which always requires a pair of wires connected into a complete circuit, light can travel from one computer to another over a single fiber. Despite their advantages, optical fibers do have some disadvantages.First, installing a fiber requires special equipment that polishes the ends to allow light to pass through.Second, if a fiber breaks inside the plastic jacket ( ), finding the location of the problem is difficult.Third, repairing a broken fiber is difficult because special equipment is needed to join two fibers so that light can pass through the joint.(2)、How many advantages of optical fibers have been mentioned in this text?
298、Computer networks also use flexible glass fibers to transmit data.Known as an optical fiber, the medium uses light to transport data, The miniature glass fiber is encased in a plastic jacket which allows the fiber to bend without breaking.A transmitter at one end of a fiber uses a light emitting diode ( ) or a laser to send pulses of light down the fiber.A receiver at the other end uses a light sensitive transistor to detect the pulses. Optical fibers have four main advantages over wires.First, because they use light, optical fibers neither cause electrical interference in other cables nor are they susceptible to electrical interference.Second, because glass fibers cab be manufactured to reflect most of the light inward, a fiber can carry a pulse of light much farther than a copper wire can carry a signal.Third, because light can encode more information than electrical signals, an optical fiber can carry more information than a wire.Fourth, unlike electricity, which always requires a pair of wires connected into a complete circuit, light can travel from one computer to another over a single fiber. Despite their advantages, optical fibers do have some disadvantages.First, installing a fiber requires special equipment that polishes the ends to allow light to pass through.Second, if a fiber breaks inside the plastic jacket ( ), finding the location of the problem is difficult.Third, repairing a broken fiber is difficult because special equipment is needed to join two fibers so that light can pass through the joint.(1)、 What is the material of the optical fiber?
297、In a star-bus topology, several star topology networks are bus connection.
296、The motherboard of a typical desktop a large printed circuit board.
