钢结构由于()多用于高层大跨度建筑工程.
A.便宜
B.取材方便
C.强度高
D.变成小
参考答案:C
I want to know ______ for the class yesterday morning. [ ]
A. why did you come late
B. why you came late
C. why do you come late
D. why have you come late
角度测量过程中,水平度盘、竖盘及其相应指标线间转动关系为()。
A.水平度盘不动,指标线移动;竖盘不动,指标线移动
B.水平度盘转动,指标线不动;竖盘转动,指标线不动
C.水平度盘不动,指标线移动;竖盘转动,指标线不动
D.水平度盘转动,指标线不动;竖盘不动指标线移动