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

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

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

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 suction pressure at the refrigeration compressor is below normal, the cause can be（）.

Which of the listed pumps is NOT a positive displacement pump?（）

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

Low compressor head pressure in a refrigeration system can be caused by（）.

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

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