【单选题】Li Lei didn't come to school today. What _______ to him? [ ]
【单选题】矿物表面润湿接触角与矿物的可浮性关系,接触角小,则矿物的(),难浮。
【单选题】I don't know____yesterday. [ ]
【简答题】计算机硬盘正在工作时应该特别注意避免____?
【简答题】She didn’t come to school yesterday .Do you know what ___her? has happened with B. had happened with C. had happened to D. has happened to
【简答题】建筑实体一般由( )( )( )( )组成构成