（）, the second one will start automatically.<br>A:If the first stand-by set failed<br>B:If the first stand-by set fails<br>C:If the first stand-by set will fail<br>D:If the first stand-by set doesn’t fail

（）, the second one will start automatically.
A:If the first stand-by set failed
B:If the first stand-by set fails
C:If the first stand-by set will fail
D:If the first stand-by set doesn’t fail

出自：海船船员证

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