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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1.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

3.單項(xiàng)選擇題When the steering wheel is turned, oil is directed to the steering gear rams by()

A.modulating the oil flow with the six-way valve
B.moving the automatic pressure differential valve
C.moving the receiving telemotor which regulates the tow-way valve
D.varying the eccentricity of a floating ting or angle of a tilting box

4.單項(xiàng)選擇題Rudder position is shown on the bridge by the()

A.rudder angle indicator
B.follow-up gear
C.telemotor position
D.relief valves

5.單項(xiàng)選擇題In an elector-hydraulic steering system, rudder shock is limited by()

A.a differential gear
B.return springs
C.a hydraulic accumulator
D.relief valves