A.公安 B.安全生產(chǎn)監(jiān)督 C.質(zhì)量技術(shù)監(jiān)督 D.環(huán)境保護(hù)
A.黃銅; B.紫銅; C.合金鋼; D.白銅
A.85% B.100% C.103.40% D.118.40%