The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.

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

One cause of high head pressure occurring in a refrigeration system can be （）.

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

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

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

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 （）.

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

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

If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.