A.立即關(guān)井 B.割心起鉆 C.強(qiáng)鉆至設(shè)計(jì)井深,割心關(guān)井 D.立即加重
A.3 B.5 C.8 D.10
A.0.3 B.0.5 C.0.7 D.1