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单选题
167 除非对系统理解很有必要,否不需要显示回流管。
A
Return lines need not be shown in entirety unless necessary to the understanding of the system.
B
An understanding of the system is necessary for the return line to be displayed in its entirety.
C
The return line does not need to be shown in its entirety unless an understanding of the entiresystem is required.
答案解析
正确答案：A
