The flow of ready-mixed concrete moves through a specially equipped chute. A worker is pushing it with a shovel. Technology

The flow of ready-mixed concrete moves through a specially equipped chute. A worker is pushing it with a shovel. Technology
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工作机器材料砂浆专业机械流体流动液体电机移动工业工程沙子混合物特写镜头混合水泥行业设备结构施工技术搅拌机金属建设者混凝土修理工具铲子

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