cosA=ACAB=610=35.
故选A.
I'm terribly sorry to turn you down this time, but I promise I will ________ to you next time.[ ]
A. pick it up
B. break it up
C. turn it up
D. make it up
基坑(槽)固壁施工支护方案应根据规范设计边坡支护形式并附设计计算书。