判斷題
單項(xiàng)選擇題
A.10%,30%,50%,70% B.20%,40%,60%,80% C.10%,50%,70%,85% D.30%,50%,70%,90%
A.1% B.0.5% C.0.2% D.0.1%
A.0.5% B.1% C.2% D.5%
A.洛氏硬度 B.布氏硬度 C.維氏硬度 D.通用硬度