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如图,已知椭圆的长轴A 1 A 2 与x轴平行,短轴B 1 B 2 在y轴上,中心M(0,r)(b>r>0 (Ⅰ)写出椭圆方程并求出焦点坐标和离心率; (Ⅱ)设直线y=k 1 x与椭圆交于C(x 1 ,y 1 ),D(x 2 ,y 2 )(y 2 >0),直线y=k 2 x与椭圆交于G(x 3 ,y 3 ),H(x 4 ,y 4 )(y 4 >0).求证: ; (Ⅲ)对于(Ⅱ)中的在C,D,G,H,设CH交x轴于P点,GD交x轴于Q点, 求证:|OP|=|OQ|(证明过程不考虑CH或GD垂直于x轴的情形)
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【简答题】请完成下列对话。 1. 가 : 집에서 학교까지 두 시간쯤 걸려요 . 나: 아니요 , 겠어요 .
【判断题】ELLIPLE命令只能用来绘制椭圆。( )
A.
正确
B.
错误
【多选题】进出口货物收发货人注册登记需要提交的材料包括()
A.
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B.
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C.
对外贸易经营者备案登记表复印件或者外商投资企业批准证书复印件
D.
其他与注册登记有关的文件材料
【单选题】We spend about an hour a day . [     ]
A.
do our homework
B.
doing our homework
C.
do our homeworks
D.
doing our homeworks
【单选题】There is not one of us wishes to help you . We are doing our best .
A.
who
B.
that
C.
as
D.
but
【单选题】It was not until one night_____we were doing our cleaning-upI got curious and wanted to see what
A.
33.It was not until one night_____we were doing our cleaning-up I got curious and wanted to see what was on the top floor. A.that;that
B.
when;so
C.
that;because
D.
when;that
【单选题】The company, we are doing our social practice, needs some more students.
A.
which
B.
that
C.
where
D.
who
【判断题】上三角矩阵主对角线以上(不包括主对角线中的元素),均为常数C。
A.
正确
B.
错误
【判断题】进出口货物收发货人与报关企业的注册登记证书有效期都是 3 年。
A.
正确
B.
错误
【判断题】直播只需遵守相关法律法规,无需考虑各大直播平台自行制定的规则政策。
A.
正确
B.
错误
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