A、氧化焰 B、碳化焰 C、中性焰 D、焰心
A、碳素鋼 B、中碳鋼 C、不銹鋼 D、高碳鋼
A、碳的質(zhì)量分數(shù)為18%,鉻的質(zhì)量分數(shù)為8% B、鉻的質(zhì)量分數(shù)為18%,鎳的質(zhì)量分數(shù)為8% C、鉻的質(zhì)量分數(shù)為18%,碳的質(zhì)量分數(shù)為8% D、碳的質(zhì)量分數(shù)為0.18%,鎳的質(zhì)量分數(shù)為8%