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判断题 It is recommended to use a mixture ratio of cement, sand and gravel for the over footing of 1:8 plus 30% of medium stones
学科：默认课程
时间：2025-11-29 05:45:20
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题目1判断题
It is recommended to use a mixture ratio of cement, sand and gravel for the over footing of 1:8 plus 30% of medium stonesA. 正确B. 错误
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