A.10%~20% B.15%~20% C.15%~25% D.20%~25%
A.防變形和抗振 B.剛度大和耐沖擊 C.抗振和剛度大 D.抗振和耐沖擊
A.收弧、滅弧 B.收弧、引弧 C.斷弧、滅弧 D.斷弧、引弧