In the event of failure of an auxiliary such as a lubricating pump, the standby pump is started and put on the line automatically“the line” in this sentence refers to（）<br>A:fuel manifold<br>B:lubricating pipe line<br>C:auxiliary engine pipe line<br>D:generator output line

In the event of failure of an auxiliary such as a lubricating pump, the standby pump is started and put on the line automatically“the line” in this sentence refers to（）
A:fuel manifold
B:lubricating pipe line
C:auxiliary engine pipe line
D:generator output line

出自：海船船员证

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