A.d^2m/8 B.m^2d/8 C.d^2m/4 D.m^2d/4
A.0.01mA B.-0.01mA C.-0.5% D.0.5%
A.計算機(jī)控制技術(shù) B.機(jī)械技術(shù) C.測試技術(shù) D.傳動技術(shù)