A、0.2%,鉻的質(zhì)量分數(shù)為13% B、0.02%,鉻的質(zhì)量分數(shù)為13% C、0.2%,鉻的質(zhì)量分數(shù)為1.3% D、2%,鉻的質(zhì)量分數(shù)為1.3%
A、Y B、Q C、H D、R
A、壓力容器 B、焊條 C、船 D、鋼軌