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 general purpose of a heat exchanger is to （）.

The major source of chemical contaminants in hydraulic fluid is （）.

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

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

A salinity indicator is used to determine the （）.

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

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

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