單項選擇題

The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.

A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second

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單項選擇題

When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.

A.flooding back
B.superheating
C.overflowing
D.recycling

單項選擇題

What is a function of the wearing rings used in most centrifugal pumps?（）

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the discharge side from the suction side
D.Dampen the turbulent discharge flow