I've got the message from Mr. Wang that what he has settled down in Canada.
去掉what
下列物理量的单位是声速单位的是( )
定义区间x1,x2长度为x2﹣x1,(x2>x1),已知函数f(x)=a2+ax-1a2x (a∈R,a≠0)的定义域与值域都是m,n,则区间m,n取最大长度时a的值为( )