http://iask.sina.com.cn/b/1770618.html?SHID=1140354741.509http://iask.sina.com.cn/b/3402940.html?SHID=1140354741.509http://iask.sina.com.cn/b/3307617.html?SHID=1140354741.509 该回答在2006-02-19 21:23:08由回答者修改过采纳为答案