Thermostatic expansion valves can be adjusted for （）.

Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）

One cause of high head pressure occurring in a refrigeration system can be （）.

The major source of chemical contaminants in hydraulic fluid is （）.

Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）

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

If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

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 （）.

A salinity indicator is used to determine the （）.

The usual symptoms of cavitation in a centrifugal pump is （）.