A.fire-tube controlled circulation
B.fire-tube supercritical circulation
C.water-tube natural circulation
D.water-tube express circulation
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A.Natural convection only
B.Forced convection only
C.Both natural convection and forced convection
D.None
A.water-tube natural circulation boilers
B.fire-tube boilers
C.water-tube forced circulation boilers
D.all of the above
A.The pistons reciprocate
B.The ‘B’ end cylinder barrel rotates
C.There is no fluid flow
D.Power is transmitted hydraulically
A.20
B.40
C.60
D.80
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
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