设X1,X2,X3是来自正态总体X~N(μ,1)的样本,设a+b+c=1,在均值μ的形如aX1+bX2+cX3的无偏估计量中,哪个最有效?
第1题
第2题
Being punctual will leave a good first impression upon interviewers.()
第3题
The book mentioned in this passage is written for readers who ______.
A.long for deeper understanding of science
B.are good at producing various gadgets
C.work in a storehouse of dried facts
D.are interested in popular science
第4题
The book mentioned in this passage is written for readers who ______.
A.long for deeper understanding of science
B.are good at producing various gadgets
C.work in a storehouse of dried facts
D.are interested in popular science
第5题
The book mentioned in this passage is written for readers who ______.
A.long for deeper understanding of science
B.are good at producing various gadgets
C.work in a storehouse of dried facts
D.are interested in popular science
第6题
The attack of the World Trade Center will leave a ______ impression on those who have witnessed the explosion.
A.long
B.forever
C.lasting
D.lively
第8题
The book mentioned in this passage is written for readers who ______.
A.long for a deeper understanding of science
B.are good at producing various gadgets
C.work in a storehouse of dried facts
D.are interested in popular science
第10题
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