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【单选题】
以下关于环境保护方案设计的原则的说法，不正确的一项是（ ）。A．坚持预防为主和环境影响最小化原则B．优先使用不可再生资源原则C．坚持资源消耗减量化原则D．坚持工程材料无害化原则A.
A
B.
B
C.
C
D.
D
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【简答题】设(X 1 ，X 2 ，…，X 9 )是取自正态总体N(2，3 2 )的一个样本，试求
【简答题】空间中 表示( )(三个字)
【单选题】The object (宾语)of the sentence “Chinese parents never care what the children really want because they believe that it is good for the children. ” is _________.
A.
Chinese parents
B.
what the children really want
C.
they
D.
children
【简答题】设(X 1 ，X 2 ，…，X n )是取自正态总体X～N(μ，σ 2 )的一个随机样本，其中μ未知，σ已知，试指出下列样本函数中的统计量和无偏估计量 (1) (2) (3)X 2 (4)
【单选题】.2.How does Nick Perrella treat his patients?
A.
He usually explains medical problems and then tells people some important things to do.
B.
. He only sings on his show to amuse his patients every week.
C.
He gives the medical advice in his singing.
D.
His program is only popular among the patients who enjoy his songs.
【单选题】Parents have to accept their children for ______ they are and not ______ they want them to be.
A.
who what
B.
where who
C.
what why
D.
how when
【简答题】假设正态总体X～N(u，1)，x 1 ，x 2 ，…，x 10 是来自X的10个观测值，要在α=0.05的水平下检验H 0 :u=0，H 1 ：u≠0，取拒绝域为 (1)求c； (2)若已知 ，求是否可以据此接受H 0 ； (3)若以 作为H 0 的拒绝域，试求检验的显著性水平α．
【判断题】设 X1, X 2, X3 是取自正态总体 X ~(mean ,s2) 的一个样本, 其中mean 已知,s 未知 ,则下列样本函数中是统计量:X1+X2+X3/3,X1/s
A.
正确
B.
错误
【单选题】People may have fewer children than they want because
A.
women are having children at a later age.
B.
they are following the example of other people.
C.
politicians want them to.
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