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单选题
1009、The function and operation of each un it in the system should be described as well as the location ofthe units. 应描述系统中各单元的功能和操作，以及各单元的位置。
A
The function and operation of each unit in the system should be described. The location of the unitsshouldn’t＇ be described.
B
The function, operation and location of each unit in the system should be deleted.
C
The function, operation and location of each unit in the system should be described. （描述）
答案解析
正确答案：C
相关知识点：
系统单元，描述功能位置
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