选择题：相对而言，用样本指标去推断相应的全及指标，点估计的可靠性比区间估计的A、高B、低C、基本相同D、时高

下列指标中属于时期指标的有A、全年出生人数B、国民生产总值C、粮食总产量D、商品销售额E、产品合格率

Realizing how serious the problem is, he tried to persuade his colleagues into a

Children may get into some bad habits (A. when; B. unless) they lack self-discip

强度相对指标是又两个不同质的指标对比得到的，其计量单位用复名数表示。A、正确B、错误

21.She didn’t remember very well where she learned the analogy of “Where are the