若点P(-1,a)和Q(1,b)都在抛物线y=-x2+1上,则线段PQ的长为__ 发布时间:2017-05-11 13:46 │ 来源:www.tikuol.com 题型:填空题 问题: 若点P(-1,a)和Q(1,b)都在抛物线y=-x2+1上,则线段PQ的长为______.
题型:填空题 ---We can use MSN to talk with each other on the Internet.---Really? Will you please show me ________ it?A.what to useB.how to useC.how can I useD.where can I use 查看答案