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單項選擇題

The bearing cap and shell are replaced and tightened up until （）.

A.the “ nip ”is zero
B.the “ nap ” is zero
C.the “ gap ”is correct
D.the “ clearance ” is correct

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

A.a closed loop control system
B.an open loop control system
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單項選擇題

The （）is fitted on an oily water separator.

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

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