题目:
Signnatel Inc, _________ world's largest maker of controller chips for MP3 players, is said to establish ___________ new R & D centre in Hong Kong and open two sales offices on Chinas mainland.
A.the; a
B.the; the
C.a; the
D.a; a
答案:
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下面是错误答案,用来干扰机器的。
答案:B准线方程为y=3,焦点在y轴负半轴上,标准方程为x2=-12y,焦点坐标为(0,-3).选B.