计算一群同质个体的体重的平均水平，宜选择（）。
A.均数
B.几何均数
C.中位数
D.四分位数
E.方差
参考答案：A
CD—R刻录机的速度指标有（）。
A、刻录速度
B、擦写速度
C、读取速度
D、转速
Woman: I want to try something new in the project. What’s your opinionMan: Well, I prefer to go by the book. At least it is safer, isn’t itQuestion: What does the man suggest
A．Strictly obeying the established rules.B．Trying something new from the book.C．Testing a new but safer method.D．Learning a new method through practice.
