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

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

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 （）.

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

The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

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

If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

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

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

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