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单选题
21、此程序解释如何识别迫在眉睫的问题以及如果发生故障该怎么处理。
A
This program describes how to identify an immediate failure and how to handle a malfunction occurred.
B
This procedure explains how to recognize impending problems and what to do if malfunctions occur.
C
How to confirm the current problems and what should you do when malfunctions occur are described in this procedure.
答案解析
正确答案：B
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