單項(xiàng)選擇題

The purpose of an air compressor unloading device is to （）

A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment

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單項(xiàng)選擇題

Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask

單項(xiàng)選擇題

To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.

A.lantern rings
B.bearings
C.easing volutes
D.wearing rings

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The purpose of an air compressor unloading device is to （）

你可能感興趣的試題

Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.