单项选择题
The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
A.sliding block
B.pintle
C.reaction ring
D.tilting box or swash plate
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相关考题
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单项选择题
Badly leaking refrigeration compressor discharge valves will cause（）.
A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver -
单项选择题
Mechanical energy in transition is referred to as （）.
A.horsepower
B.work
C.heat
D.velocity -
单项选择题
If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.
A.compressor lubrication will be improved
B.oil will not leave the crankcase
C.compressor valves will be damaged
D.oil may congeal in the evaporator
