单项选择题
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
单项选择题 Which of the following is NOT the advantages of the remote control and automation of engine operations?（）
单项选择题 The load rating of an AC generator is determined by the（）
单项选择题 The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
