题型:问答题 简答题 观测值反映现象在一段时期内发展的总量,其特点是序列中的各观测值可以累加,累加后的观测值反映现象在更长一段时期内发展总量的序列属于()。A.平均数序列B.时点序列C.相对数序列D.时期序列 查看答案
题型:问答题 简答题 — Haven't you seen the speed limit sign? Please drive _____. —Sorry, but I have to. [ ]A. more slowly a bit B. slowly a bit more C. a bit more slowly D. slowly more a bit 查看答案