发布时间:2025-01-30 11:06:11
同样开门宽度中分门开门速度会快一些,同样宽度,理论上旁开门滑动部件磨损会快一点。如果是货梯,经常拖车货物进出旁开门因为单边开,被撞的几率会小一些。
厂房共3层第一层高7二三层6第一层柱子c40二三层c30 结果打混泥土时一层有7根打成c30 咋办
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