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当前学科:城镇燃气设计规范
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按照《城镇燃气设计规范》GB50028—2006,高压城镇燃气管道通过的地区,应按沿线建筑物的密集程度,划分为()个地区等级。
A . A、三
B . B、四
C . C、五
D . D、六
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