A.2/1000-3/1000 B.3/100-5/100 C.1/1000-3/1000 D.1/100-3/100
A.長(zhǎng)向跨度≧3m B.短向跨度≧3m C.長(zhǎng)向跨度≧4m D.短向跨度≧4m
A.勞動(dòng)強(qiáng)度大 B.工程量較大 C.施工難度大 D.工期較長(zhǎng)