A.10mm,5s~30s B.10mm,5s~25s C.20mm,5s~30s D.20mm,5s~25s
A.飲用水 B.地表水 C.地下水 D.混凝土企業(yè)生產(chǎn)設(shè)備洗刷水
A.4% B.6% C.8% D.10%