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

One cause of high head pressure occurring in a refrigeration system can be （）.

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

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

Thermostatic expansion valves can be adjusted for （）.

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

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

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

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

A salinity indicator is used to determine the （）.