A.large size of oil globule
B.low temperature
C.high viscosity
D.high flow rate
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A.with dirty water
B.with clean water
C.by oily water
D.by mixed water
A.upwards
B.downwards
C.outwards
D.forwards
A.bowl periphery
B.bowl center
C.upper surface
D.lower surface
A.bowl periphery
B.bowl center
C.upper surface
D.lower surface
A.purifying
B.batch
C.long period
D.temporary
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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, （）.
A pressure drop through the refrigerant liquid line may cause （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A salinity indicator is used to determine the （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
A grease gun is generally used to lubricate a （）.