Thermostatic expansion valves can be adjusted for （）.

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

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

The general purpose of a heat exchanger is to （）.

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

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

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?（）

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

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