I'm sorry,I misunderstood, you mean x,y,or z=0.

来源: jinjing 于 2010-09-05 07:47:12 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.