A pressure drop through the refrigerant liquid line may cause （）.

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.

The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.

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 （）.

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.