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單項(xiàng)選擇題

Auxiliary boilers can be classified as（）

A.water-tube natural circulation boilers
B.fire-tube boilers
C.water-tube forced circulation boilers
D.all of the above

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單項(xiàng)選擇題

When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?（）

A.The pistons reciprocate
B.The ‘B’ end cylinder barrel rotates
C.There is no fluid flow
D.Power is transmitted hydraulically

單項(xiàng)選擇題

The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of（）

A.20
B.40
C.60
D.80