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

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 （）.

Which of the listed pumps is NOT a positive displacement pump?（）

Thermostatic expansion valves can be adjusted for （）.

A salinity indicator is used to determine the （）.

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）

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

If the head pressure of a reciprocating refrigeration compressor is excessive, （）.

A grease gun is generally used to lubricate a （）.

Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.