单项选择题
A.Electrical energy B.Thermal energy C.Potential energy D.Kinetic energy
The delivery rate of an axial-piston hydraulic pump is ...
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
Badly leaking refrigeration compressor discharge valves...
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
Mechanical energy in transition is referred to as （）.A....
单项选择题Mechanical energy in transition is referred to as （）.
A.horsepower B.work C.heat D.velocity
