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

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

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

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

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

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

The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

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

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

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