单项选择题
If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.
A.run continuously B.not start C.have high discharge pressure D.short cycle on the high pressure switch
单项选择题 Which of the following terms could be applied to the simple definition the energy of motion?（）
单项选择题 The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
单项选择题 Badly leaking refrigeration compressor discharge valves will cause（）.
