单项选择题
The internal force of a material, which tends to resist deformation when subjected to external forces, is known as （）.
A.stress B.strain C.shear strength D.ultimate tensile strength
单项选择题 An increase in rotor clearances in a rotary pump will （）.
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?（）
