数据库自启动文件在版本携带了，该文件名为（），安装的时候需要将该文件拷贝至/etc/

— How did you get paid from your work?

— As a rule, we were paid ______. [ ]

A. by hour

B. by the hour

C. by an hour

D. by hours

名义国内生产总值与实际国内生产总值之比称为______。

从各国、各地区经济发展与土地需求变动来看，土地需求变动趋势大体与经济循环趋势呈反比走势。( )

什么情况下应紧急停止风机运行？