单项选择题

What is the big problem for Dave now?

A．can not do what he wants to do
B．do not live near his family
C．do not have very close friend

<上一题目录下一题>

热门试题

单项选择题通过对Shell进行编程，可使大量任务自动化，对于系统管理、系统维护方面特别有用。 A、正确 B、错误

多项选择题瑞利散射又叫分子散射，其散射光的强度与（）