题目内容

2 save your life!

A. must
B. can
C. need
D. have to

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Mobile phones are also 3 because they have many good features

A. annoyed
B. interested
C. interesting.
D. annoying

t分布的自由度越大,相同概率的t界值越大。()

开凿或延深斜井、下山时,在掘进工作面的上方设置坚固的()。
A 防止跑车装置
B 跑车防护装置
C 防坠器

置信区间CI是随机的,总体参数是固定的。()

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