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

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

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

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

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

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

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

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

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