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【简答题】
已知椭圆C以F 1 (-1,0),F 2 (1,0)为焦点,且离心率 e= 2 2 (Ⅰ)求椭圆C的方程 (Ⅱ)过 M(0 , 2 ) 点斜率为k的直线l 1 与椭圆C有两个不同交点P、Q,求k的范围 (Ⅲ)设椭圆C与x轴正半轴、y轴正半轴的交点分别为A、B,是否存在直线l 1 ,满足(Ⅱ)中的条件且使得向量 OP + OQ 与 AB 垂直?如果存在,写出l 1 的方程;如果不存在,请说明理由
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A.
a most beautiful
B.
the most beautiful
C.
the more beautiful
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A.
正确
B.
错误
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A.
a wonderful
B.
the most wonderful
C.
wonderful
D.
most wonderful
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A.
called
B.
helped
C.
stopped
D.
met
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A.
正确
B.
错误
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A.
the most humorous
B.
a most humorous
C.
a more humorous
D.
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A.
the most I like it
B.
I like it the most
C.
the more I like it
D.
I like it the most
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A.
the most humourous
B.
a most humourous
C.
a more humourous
D.
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