题目

当你想告诉别人火车在车站时，你会说： （ ）A.The train is at the station. B.The train is near the station. 答案：【答案】A【解析】略若数列{an}满足＝p(p为正常数，n∈N?)，则称{an}为“等方比数列”．若甲：数列{an}是等方比数列；乙：数列{an}是等比数列，则甲是乙的             条件．