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 （）.

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 （）.

If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

A salinity indicator is used to determine the （）.

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

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

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

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