A.2.5m B.3.0m C.3.5m D.4.0m
A.1/6 B.1/5 C.1/4 D.1/3
A.質(zhì)量好 B.保護(hù)環(huán)境 C.工人勞動強(qiáng)度高 D.施工工藝簡單 E.生產(chǎn)效率高