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B 级硐室爆破
expl. grade B chamber blasting
级硐室爆破
expl. graded chamber blasting D
A 级硐室爆破分露天硐室爆破和地下硐室爆破。见《爆破安全规程》 (GB6722)
expl. grade A chamber blasting
C 级硐室爆破
expl. grade C chamber blasting