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地質(zhì)勘查鉆探巖礦心管理通則
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3.開間×進(jìn)深,m: 開間4~6,跨度9、12、15(由實(shí)際需要定)

4.結(jié)構(gòu):     根據(jù)具體情況可為混合結(jié)構(gòu)或框架結(jié)構(gòu),地震區(qū)按烈度降低1度設(shè)防。

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