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灌注桥墩混凝土时为节省水泥用量可在混凝土中填加石块，其填放用量不超过（）。
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灌注桥墩混凝土时为节省水泥用量可在混凝土中填加石块，其填放用量不超过（）。
A、10％
B、20％
C、30％
D、15％
时间：2021-12-30 14:45
关键词：
基础医学
林学
铁路职业技能鉴定考试
铁路工务系统考试
答案解析
B
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