单项选择题
A.proportional control
B.integral control
C.derivative control
D.on-off control
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（）
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（）