单项选择题
An increase in rotor clearances in a rotary pump will （）.
A.increase discharge pressure B.decrease pump capacity C.decrease pump cavitation D.decrease reaction ring clearance
单项选择题 Sweating of the refrigeration system compressor crankcase is caused by （）.
单项选择题 Which bearing will carry the load on two small points diametrically opposite to each other?（）
单项选择题 Refrigeration system compressor crankcase sweating is an indication of （）.
