皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【单选题】
下列各组属于同分异构体的是
A.
C2H6 和C3H8
B.
正丁烷和异丁烷
C.
O2和O3
D.
16O和18O
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】身既死兮神以灵, 。
【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(  )
A.
3
B.
3 2
C.
3 3
D.
3 4
【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( )
A.
x-y+1=0
B.
x+y-5=0
C.
x-y-1=0
D.
x-2y+1=0
【单选题】已知点A(0,0),B(4,-2),则线段AB的中点坐标为( )
A.
(2,-1)
B.
(-2,1)
C.
(-2,4)
D.
(0,0)
【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。
A.
正确
B.
错误
【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(  )
A.
1
B.
2
C.
3
D.
4
【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
B.
cleared
C.
dirtied
D.
Thrown
【单选题】已知点A(-4,0),B(2,-4),则线段AB的中点坐标是( )
A.
(-2,-4)
B.
(-1,-2)
C.
(0,0)
D.
(1,2)
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题