单项选择题
基坑开挖时,基底高程允许偏差()。
A.土质±50mm,石质+50,-200mm
B.土质±20mm,石质+50,-100mm
C.土质±50mm,石质+50,-100mm
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单项选择题
A.土质±50mm,石质+50,-200mm
B.土质±20mm,石质+50,-100mm
C.土质±50mm,石质+50,-100mm
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