A.1 B.2 C.3 D.4
A.爆破材料質(zhì)量差 B.炸藥用量不足 C.網(wǎng)路敷設(shè)質(zhì)量差 D.起爆電流不足
A.成本評(píng)估 B.質(zhì)量評(píng)估 C.安全評(píng)估 D.生產(chǎn)評(píng)估