Which of the following statements is correct concerning heat transfer?（）

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

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

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 （）.

A salinity indicator is used to determine the （）.

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

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.

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

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