A grease gun is generally used to lubricate a （）.

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

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

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

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

A salinity indicator is used to determine the （）.

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

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

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

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