单选题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（）Afuel manifoldBlubricating pipe lineCauxiliary engine pipe lineDgenerator output line
单选题
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
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名词解释题失效时间failure event