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 （）.

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

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

When the steering gear is in operation, you should （）.

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

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

The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.

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

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