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【单选题】
楼梯从舒适的角度考虑,常用的坡度为( )。A.
10°~20°
B.
20°~25°
C.
20°~45°
D.
35°~45°
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【多选题】以下哪些是钢材的流通加工形式?( )。
A.
钢板的切割
B.
使用矫直机将薄板卷材展平、纵向切割薄板卷，使之成为窄幅(钢管用卷材 )
C.
汽割厚板
D.
切断成形钢材
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A.
each ant has many roles
B.
they exist in every part of the planet
C.
they are very successful
D.
they have societies which are organized
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