【单选题】最先提出和使用“社区”这一概念的( )。
【单选题】In a seven-minute debate, how long should the opposition leader spend on rebuttal?
【简答题】扭转的受力特征是 ( ) ,变形特征为 ( )
【单选题】More than seven in ten get angry ________ to wait longer than one minute for a web page to be downloaded.
【单选题】In a seven minute debate, how long should the opposition leader spend on rebuttal?
【单选题】Seven short blasts continued for one minute means ().