通过窄路、窄桥时，不得超车。
参考答案：对
If a distribution exhibits positive skewness, then the mean is most likely located to the:()
A. left of both the median and mode.
B. right of both the median and mode.
C. left of the median and right of the mode.
下列属于面向对象数据库产品有（ ）。Ⅰ．Gemstone Ⅱ．Obiectivity Ⅲ．O2 Ⅳ．Versant
A．Ⅰ，Ⅱ和Ⅳ
B．Ⅰ，Ⅱ和Ⅲ
C．Ⅰ，Ⅲ和Ⅳ
D．全部
