【简答题】翻译句子:Wind blowing across the suce of a body of water produces waves. The wave height depends upon the amount of energy transferred to the water and therefore increases with wind velocity(速度), the t...
【简答题】手写翻译下面内容 China’s novel coronavirus outbreak has forced millions of parents across China to share space with their children schooling from home as campuses from the elementary to university level exten...
【单选题】当x∈(0,+∞)时,幂函数y=(m 2 -m-1) 为减函数, 则实数m的值为( )
【单选题】中国在2011年发射“天宫”一号目标飞行器,如图所示,标志着我国的空间站建设正式开始,宇航员在空间站内可直接对话,但在空间站外工作时,必须借助电子通讯设备才能进行通话,原因是( )
【单选题】幂函数 y=( m 2 -m-1) x m 2 -2m-3 当x∈(0,+∞)时为减函数,则实数m值为( )
【单选题】当x∈(0,+∞)时,幂函数y=(m 2 -m-1)x -m-1 为减函数,则实数m=( )
【单选题】当x∈(1,+∞)时,幂函数y=x α 的图象恒在y=x的下方,则α的取值范围是( )