碗扣式钢管脚手架中的普通架是最常用的一种，构造尺寸为15Om（立杆纵距）×l2Om（立杆横距）×180m（横杆步距）。（）
参考答案：对
1.She tried to _____ out of the window to see the procession more clearly.
A. bend B. lean C. bow D. slope
2．Throughout most of their lives, humans _____ learn and increase their mental capacity.
A. actually B. readily C. fairly D. primarily
评标委员会提出书面评标报告后，招标人一般应当在( )日内确定中标人，但最迟应当在投标有效期结束30个工作日前确定。
A．5B．10C．15D．20
