單項(xiàng)選擇題

Moisture in a D-Cmotor would cause （）.

A.short circuit
B.speed up
C.slow down
D.hunting

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單項(xiàng)選擇題

Prior to any overhaul work on electric equipment, it is important to ensure the circuits are （）.

A.live
B.dead
C.excited
D.on line

單項(xiàng)選擇題

（） control system is one in which the control action is independent of the output.

A.Feed back
B.Negative feed back
C.Close loop
D.Open loop