【单选题】已知命题 所有指数函数都是单调函数,则 为( )
【单选题】已知 是定义在 上的不恒为零的函数,且对任意的 都满足 ,则 是
【单选题】Every one of us must know this: _________ we live can we save the earth.
A.
by changing the way only
B.
by only changing the way
C.
only by changing the way
D.
by changing only the way
【单选题】函数f(x)=e x -e -x (e为自然对数的底数)( )
【单选题】Only in that way _______ ready for the challenges and opportunities in life.
【单选题】设Q为有理数集,函数 f ( x ) = g ( x )= ,则函数 h ( x )= f ( x )· g ( x )