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

The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.

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

If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

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

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

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

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

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

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