为了防止灌注混凝土过程钢筋骨架上浮,当混凝土拌和物上升到骨架底口()m以上时,提升导管,使其底口高于骨架底部2m以上,然后恢复正常灌注速度。
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5英寸软盘的一个角上有一个滑动块,如果移动该滑动块将小孔关闭,则该软盘 ()
A. 不能读但能写
B. 不能读也不能写
C. 只能读不写
D. 能读写
地下燃气管道如果是钢管道,则给水管道的最小垂直净距为()m。
A. 0.10
B. 0.12
C. 0.15
D. 0.20
新浇筑混凝土的强度尚未达到()MPa寸,距新浇筑混凝土30m范围,不得进行沉桩施工。
A. 25
B. 20
C. 15
D. 5
A.They are feeling very tired.B.They think the climbing is rewarding.C.They are a littl
A. They are feeling very tired.
B. They think the climbing is rewarding.
C. They are a little bit disappointed.
D. They don't feel anything special.