A.40t B.50t C.60t D.70t
A.進(jìn)場(chǎng)復(fù)驗(yàn)報(bào)告B.生產(chǎn)許可證C.施工記錄D.接頭力學(xué)性能試驗(yàn)報(bào)告
A.50% B.75% C.90% D.100%