【单选题】The world's deepest cave, Pierre St. Martin in the Pyrenees mountains, is almost three times as deep ______.
A.
as the Empire State Building is high
B.
that the Empire State Building is higher
C.
is higher than the Empire State Building
D.
and the Empire State Building's height
【单选题】已知点A(0,b),B为椭圆 x 2 a 2 + y 2 b 2 =1(a>b>0)的左准线与x轴的交点,若线段AB的中点C在椭圆上,则该椭圆的离心率为( )
【简答题】巴黎的() ,是法国历史上第一个公共花园
【单选题】已知点A(4,1),B(2,3),则线段AB的垂直平分线方程为( )
【单选题】已知点A(0,0),B(4,-2),则线段AB的中点坐标为( )
【判断题】肋片是依附于基础表面上的扩展表面,是有效增加换热面积的方法。
【单选题】已知抛物线y=ax 2 -4ax+h(a≠0)与x轴交于A(x 1 ,0),B(3,0)两点,则线段AB的长度为( )
【单选题】The waters of this great lake, which is also the world's deepest, have been ____ by waste from
A.
105. The waters of this great lake, which is also the world's deepest, have been ____ by waste from a chemical factory. A.cleaned
【单选题】已知点A(-4,0),B(2,-4),则线段AB的中点坐标是( )