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【单选题】
设总体 以等概率 取值 ,则未知参数 的矩估计值为A.
,
B.
,
C.
,
D.
。
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反馈参考答案：
举一反三
【单选题】One day , Tom's teacher , Miss Mak, held a class meeting . " There will be a flag next Saturday. Does anyone want to join this meaningful event( 活动) ?" asked Mis Mak. Tom was interested in raising mon...
A.
He had other plans.
B.
He didn't like Miss Mak.
C.
He was not interested in the activity
D.
He was not brave enough to tlak to the strangers.
【简答题】求职信的写作有哪些注意事项？
【单选题】I don’t like to speak English because I’m afraid ___________mistakes.
A.
making
B.
to mak ing
C.
of making
D.
in making
【单选题】— Must I go to medical school and be a doctor like you，Dad? — No，you__________，son．You’re free to make your own decision．
A.
can’t
B.
mustn’t
C.
shouldn’t
D.
needn’t
【单选题】Finding information in today's world is easy. The is how you can tell if the information you get is useful or not. [ ]
A.
ability
B.
competition
C.
challenge
D.
knowledge
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