A.the oil content in water
B.the water content in fuel oil
C.the water level in bilge well
D.the oil level in bilge well
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A.whenever
B.however
C.wherever
D.whether
A.negative displacement type
B.turbine type
C.positive displacement type
D.mixed-flow type
A.well ventilated
B.well clean
C.in good order
D.more room
A.lower
B.higher
C.the lower
D.the higher
A.evaporation
B.frosting
C.condensing
D.compressing
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If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
When the steering gear is in operation, you should （）.
The general purpose of a heat exchanger is to （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Low compressor head pressure in a refrigeration system can be caused by（）.