为什么说框架梁纵筋的保护层规定为25毫米而不是30毫米?
参考答案:因为框架柱承受压力,框架梁承受拉力,保护层太小会降低梁的有效高度,减少梁纵筋的受力性能。
_____ of the students who took part in the military training is 750.
A.A number
B.A lot
C.Dozens
D.The number