小样本情况下,总体服从正态分布,总体方差已知,总体均值在置信水平(1-α)下的置信区间为()
参考答案:对
He _____ home once a week, but after entering middle school, he _____ home once a month. [ ]
A. was used to go, was used to go
B. used to go, was used to go
C. was used to go, used to
D. used to go, was used to going
以下属于军事设施的有()。①用于军事目的的指挥、地面和地下指挥工程、作战工程;②军用机场、码头;③卫星系统;④营区、训练场、试验场;⑤物资仓库;⑥公路、铁路线;⑦军用输油、输水管道
A.①②③④⑤⑥⑦
B.①②③④⑤⑥
C.②③④⑤⑥⑦
D.①②④⑦