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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1.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
2.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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If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
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An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
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Thermostatic expansion valves can be adjusted for （）.
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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
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A salinity indicator is used to determine the （）.
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