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

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

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

A salinity indicator is used to determine the （）.

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

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

If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.

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

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 （）.