单项选择题
A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.
A.condition of the expansion valve
B.moisture in the system
C.condition of the compressor suction valves
D.condenser temperature
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If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.
A.trick wheel
B.accumulator
C.standby pump
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单项选择题
The bilge system has been performing well; however, the aft starboard engine room bilgewell suddenly fails to be pumped outWhich of the following should be done first to determine the cause?（）
A.Open the bilge pump for inspection
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单项选择题
If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
A.too much refrigerant in the system
B.oil entrained in the refrigerant
C.less than a full charge of refrigerant in the system
D.ice crystals forming in the refrigerant
