【单选题】梁.板截面尺寸还应满足按模数要求,利于模板定型化。如梁的截面高度h≤800mm时,以____为模数,当h>800时,以____为模数。截面宽度b>250mm时.以___为模数。且梁的高宽比h/b,矩形取2~3.5,T型取2.5~4。( )
【简答题】矩形截面梁尺寸宽250mm,高450mm,安全等级二级,环境类别一类,弯矩设计值为M=150kN*M,混凝土强度等级C30,钢筋采用HRB400级钢筋。
【单选题】休克早期“自身输血”主要作用是指:
A.
静脉血管收缩而使回心血量增加 ,如肝脾血窦内血液回心。
【简答题】Of course, she wasn't really my aunt and, out of fear, I never called her that to her face. I only ____ to her as 'My Aunt Fannie' because it always made my father chuckle and my mother look ____ at ...
【简答题】矩形截面梁尺寸宽250mm,高250mm,安全等级二级,环境类别一类,弯矩设计值为M=150kN*M,混凝土强度等级C30,钢筋采用HRB400级钢筋。 求所需的受拉钢筋。