什么是结构施工图
参考答案：结构施工图是指图样上标为“结施”的部分图样，是房屋承受外力并传递给基础的结构部分。
_____, we must climb up to the top. [ ]
A. However high is the mountain
B. However high the mountain is
C. However the mountain is high
D. However is the mountain high
句子变换形式有哪些情况？
