— What's ____________ name?
— His name is Zhang Peng. [ ]
A. your
B. my
C. his
答案:C
从参加数学竞赛的1000名学生中抽取一个容量为50的样本,按系统抽样的方法,如果第一部分编号为0001,0002,0003,…,0020,第一部分随机抽取一个号码为0015,则抽取的第40个号码为______.
3个m相乘,可以写成[ ]
A.3m
B.m2
C.3+m
D.m3