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

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

The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

Thermostatic expansion valves can be adjusted for （）.

Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）

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

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

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

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

If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.