In geometry,an ellipse may be defined as the locus of all points,____distances from two
fixed point is constant.
A)which as the sum of
B)whose sum that the
ＡＢ怎么解释，我辨析不了．谢谢作者: topway5 时间: 2004-10-9 13:27
你给的KEY好像不正确， 您再查查， 此题偶见过， 记得不是这样的。 请指正
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