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

When the steering gear is in operation, 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 （）.

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

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

A salinity indicator is used to determine the （）.

If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.

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

Which of the following statements is correct concerning heat transfer?（）

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