A.受力變形 B.受冷變形 C.切削變形 D.溫差變形
A.0.002mm/1000mm,0.01mm/全長 B.0.003mm/1000mm,0.015mm/全長 C.0.005mm/1000mm,0.01mm/全長 D.0.004mm/1000mm,0.02mm/全長
A.只許內(nèi)凹 B.不許外凸 C.只許外凸 D.不許內(nèi)凹