An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.

If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.

The general purpose of a heat exchanger is to （）.

The rate of heat transfer from a hot region to a cold region is affected most by the （）.

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

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

Thermostatic expansion valves can be adjusted for （）.

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 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 （）.