你可能感興趣的試題

單項(xiàng)選擇題

When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.

A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced

單項(xiàng)選擇題

If the refrigeration compressor crankcase is sweating, the cause may be due to （）.

A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout