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【简答题】
已知动圆过定点P（1，0），且与定直线l：x=-1相切； （1）求动圆圆心M的轨迹方程； （2）设过点P且斜率为 - 3 的直线与曲线M相交于A、B两点，求线段AB的长．
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举一反三
【简答题】游戏舞蹈创编方法有 、 、 三大类。
【单选题】We of this opportunity to approach you for the establishment of trade relations withyou.
A.
take
B.
avail
C.
avail ourselves
D.
take ourselves
【简答题】______ is a complex solid material composed of two or more materials that are combined by physical means and do not lose their identity.
【单选题】听力原文：W: Hi Tim! How are you? M: Fine, thank you. W: I'd been wondering when I'd run into you. Have you been here long? M: I arrived yesterday, on Sunday. How about you? W: I got here a few days ago, o...
A.
Tuesday.
B.
Friday.
C.
Saturday.
D.
Sunday.
【简答题】We __ __ __ this opportunity to approach you for the establishment of trade relations
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