作业环境空气质量合格率ηk、有效风量率ηu合格标准为()%
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拆除柱子,应沿柱子底部剔凿出钢筋,使用手动倒链定向牵引,采用气焊切割柱子三面钢筋,保留牵引方向正面的钢筋()
I don’t understand ____ believe him.
A. why don ’t you
B. why you no
C. why you don ’t
D. why not you
墙或柱是建筑物的承重配件,承受屋顶、楼板下传来的各种荷载,并连同自重一起传给基础()
The little boy didn’t know_______.
A. Which hat is hi
B. which hat his is
C. which hat was his
D. which hat his was