【单选题】( )是控制与消除产品缺陷的责任主体,应当主动对缺陷产品实施召回。
【单选题】下列哪个选项不属于辐射防护的管理原则:()
【单选题】We are so tired. ______ we could take the day off tomorrow!
【判断题】只有可逆过程的 G D才可以直接计算。 ( )
【简答题】Beside the phrases mentioned in the video, are there other expressions that can make a speaker polite and nice? If so, what are they?