单项选择题
A.stress B.strain C.shear strength D.ultimate tensile strength
An increase in rotor clearances in a rotary pump will （...
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
Sweating of the refrigeration system compressor crankca...
单项选择题Sweating of the refrigeration system compressor crankcase is caused by （）.
A.too much superheat B.insufficient superheat C.suction pressure too low D.excessive refrigerant returning to the compressor
Which bearing will carry the load on two small points d...
单项选择题Which bearing will carry the load on two small points diametrically opposite to each other?（）
A.Needle B.Tapered roller C.Roller D.Ball
