采用系统抽样法,从121人中抽取一个容量为12人的样本,求每人被抽取的机率.
由已知中总体容量为121,样本容量为12,
则每个个体被抽到的概率P=12121.
. --- Bruce, could you tell me where __________ was ___________ you first met Mr. Carl?
--- In the park where I often go.
A.it; that
B.that; which
C.it; what
D.that; it
手动铺砂法测试中,用推平板将量砂摊铺呈圆形的正确方法为()。
A.由上而下重复摊铺
B.由左至右重复摊铺
C.由里向外重复摊铺
D.随即摊铺