407.Center of gravity is the point at which an airplane would balance if suspended Its distance from the reference datum is: found by dividing the total moment by the total weight of the airplane ( )

530. Instead of using the actual date of issue on each page of an original issue of a Document， the words "original issue" may be used In such a case， the Title Page and the Table of Contents pages preceding each section of the Document mustbear the actual date of issue following the words "original issue"

529.反推是把尾喷管的反向形成的力( )

528.The procedures shall clearly describe the step by step operation in a logical work flow sequence as necessary to gain access to and subsequently remove the hardware or install the hardware ( )

527.Show the date of the revision on each revised page( )

526.flow of fluid through the valve must be continuous( )

525.Each manual shall carry a list of Chapters or Sections contained in it ( )

524.如果机体制造商以任何方式改变部件制造商的文字或说明他应使用自己的刊头( )

523.STE 词典给出了一个经过批准的存不同词性的替代词。 ( )

522.The precision of the gauges must agree with the applicable quality standard( )

521. The Federal Aviation Regulations require the use of "maximum continuous power" ， during certification of anairframe and engine combination， to show compliance with certain standards