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

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

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）

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

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

Thermostatic expansion valves can be adjusted for （）.

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

A pressure drop through the refrigerant liquid line may cause （）.

A grease gun is generally used to lubricate a （）.

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