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

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

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

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

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

The usual symptoms of cavitation in a centrifugal pump is （）.

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 （）.

A salinity indicator is used to determine the （）.

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

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