已知双曲线x2a2-y2b2=1(a>0,b>0)的一条渐近线方程为y=43x,则双曲线的离心率为( )
We are not ready to go into production yet.The new switch mechanism isn't fully__________.( )
2010年第六次我国的人口普查,我国人口总数是多少亿( )
My brother is always the first_______ to school.