A.0.02mm,0.20mm,0.03mm B.0.20mm,0.03mm,0.03mm C.0.20mm,0.20mm,0.04mm D.0.30mm,0.20mm,0.03mm
A.65% B.70% C.75% D.80%
A.彈性極限 B.抗拉強(qiáng)度 C.線性膨脹系數(shù) D.許用應(yīng)力