除硅芯管外，管道工程铺设完成后，应按邮电部门的规定做（）检验，以保证管道的施工质量。
A.试通
B.拉棒
C.牵引
D.拉线
参考答案：B
若复数z满足z2-z+1=0，则|z|=______．
Questions 1-4
Which of the following is NOT an aim set by the parliament for the study circle？（）
A．To raise funds for the disadvantaged.
B．To further individuals’ own creativity.
C．To broaden participants’ interest in culture.
D．To narrow and bridge educational gaps.
