选择纵向围堰位置与以下因素()有关。
A.地形地质条件
B.水工布置
C.河床允许束窄度
D.导流过水要求
E.施工布置的合理性
F.对外交通条件
参考答案:A, B, C, D, E
x=3是方程a-5x=-3x+8的解,则a的值是______.
A.To keep the accounts.
B.To write letters and answer the telephone.
C.To organize business trips and conferences.
D.To look after the models and keep them happy.