单项选择题

TWO STEP CONTROLER ACTION is mainly（）

A.proportional control
B.integral control
C.derivative control
D.on-off control

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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
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Which of the following is NOT the advantages of the remote control and automation of engine operations?（）

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