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论述了地下人防工程对建筑物产生的危害 ,产明了采用MD - 50锚杆钻机打斜孔、注水泥浆的整治措施是既先进又安全的
Discussed the hazards of underground civil air defense projects on buildings, and showed that the MD 50 rockbolt drilling rigs used for oblique holes and grouts were both advanced and safe.