A、regulate the fluid flow in either direction
B、restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction
C、allow free movement of hydraulic fluid in both directions
D、allow a restricted fluid flow in one direction only
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A、A.check the air filter for obstruction B、B.check for an exhaust leak C、C.check the exhaust temperature D、D.secure the engine
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A、A.等价于VAL（‘A’，END）＋A的回零后值-A的回零前值-VAL（‘A’，BEG） B、B.等价于VAL（‘A’，END）＋A的回零后值＋A的回零前值＋VAL（‘A’，BEG） C、C.等价于VAL（‘A’，END）－A的回零后值-A的回零前值＋VAL（‘A’，BEG） D、D.等价于VAL（‘A’，END）－A的回零后值＋A的回零前值-VAL（‘A’，BEG）
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A、check the flame arrester B、check the fuel tank C、check the battery D、ventilate the bilges
A、check it with a barometer on another vessel B、take readings from several barometers and average them C、check it with the barometer at the ship chandlery D、check it against radio or National Weather Service reports of the immediate vicinity
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