建筑房屋时,瓦工师傅常用重垂线来判断墙砌得是否______,其根据是______.
根据重力的方向竖直向下,制成重锤,检查墙是否竖直.
故答案为:竖直;重力方向总是竖直向下.
样式型服装市以宽松、舒展的形式将衣料覆盖人体上,起源于()地区的一种服装样式。
A.寒带
B.热带
C.亚热带
D.温带
If $2000 a year is invested at the end of each of the next 45 years in a retirement account yielding 8.5 percent, how much will an investor have at retirement 45 years from today()
A. $100135.
B. $ 277700.
C. $ 901060.