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

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?（）

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

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

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

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

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

The rate of heat transfer from a hot region to a cold region is affected most by the （）.

Thermostatic expansion valves can be adjusted for （）.

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