图示结构用位移法计算时的基本未知量最小数目为：（）
A.10
B.9
C.8
D.7
参考答案：B
图中河流含沙量最大的河段是
—A new 3D movies on. Shall we go and see it this weekend?
—______! What's it? [ ]
A. I must be going now
B. You are right
C. Why not
D. My pleasure
