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單項(xiàng)選擇題

Crankcase sweating in a refrigeration system is caused by （）.

A.a stuck solenoid valve
B.a shortage of refrigerant
C.too much oil in circulation
D.too much superheat

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單項(xiàng)選擇題

In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.

A.trick-wheel
B.follow-up control
C.six-way valve
D.Rapson slide

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