It is so wet there that the trees are extremely tall, some ____(measure) over 90 metres.
我国人口最多的少数民族其所有省区的简称是( )
已知函数f(x)=ex﹣ax﹣a(其中a∈R,e是自然对数的底数,e=2.71828…).
(Ⅰ)当a=e时,求函数f(x)的极值;
(Ⅱ)若f(x)≥0恒成立,求实数a的取值范围.