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單項(xiàng)選擇題

In （）the control action is independent on the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear

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單項(xiàng)選擇題

The （）is fitted on an oily water separator.

A.sliding bowl bottom
B.gravity disc
C.bowl
D.liquid level detector

單項(xiàng)選擇題

The （）is not a component of an oil separator.

A.sliding bowl bottom
B.gravity disc
C.separating disc
D.scum valve

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