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單項(xiàng)選擇題

The internal force of a material, which tends to resist deformation when subjected to external forces, is known as （）.

A.stress
B.strain
C.shear strength
D.ultimate tensile strength

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單項(xiàng)選擇題

An increase in rotor clearances in a rotary pump will （）.

A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
D.decrease reaction ring clearance

單項(xiàng)選擇題

Sweating of the refrigeration system compressor crankcase is caused by （）.

A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor

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