單項(xiàng)選擇題
A.10% B.20% C.30% D.40%
A.5% B.10% C.15% D.20%
A.50% B.40% C.60% D.80%
A.0.5~1 B.1~1.5 C.1.5~3 D.2~4
A.30%B.50%C.80%D.60%
A.10% B.5% C.15% D.20%
A.D卷≥14d繩 B.D卷≥（16～20）d繩 C.D卷≥16d繩 D.D卷≥25d繩
A.D滑〉14d繩 B.D滑〉18d繩 C.D滑〉16d繩 D.D滑〉20d繩
A.3% B.5% C.10% D.20%
A.普通低碳鋼 B.16Mn鋼 C.20Mn鋼 D.工具鋼
A.15 B.21 C.19 D.10
微信掃一掃關(guān)注公眾號(hào)后聯(lián)系客服
微信掃碼免費(fèi)搜題
