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【简答题】
设总体X的均值u及方差σ 2 都存在，且有σ 2 ＞0，但u及σ 2 均为未知，又设(X 1 ，X 2 ，…，X n )是来自X的样本，试求u、σ 2 的矩估计量
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举一反三
【单选题】A car accident happened on the highway because of the heavy fog, but no one got seriously injured.
A.
sadly
B.
luckily
C.
hopefully
D.
unfortunately
【单选题】So far hundreds of flights ____ because of the heavy fog .
A.
are canceled
B.
will be canceled
C.
were canceled
D.
have been canceled
【单选题】We were stuck at the airport because of the heavy fog, otherwise we ________ here in time for the conference.
A.
arrived
B.
had arrived
C.
would arrive
D.
would have arrived
【单选题】All flights ______because of the heavy fog, we had to decide to take the train.
A.
were canceled
B.
having canceled
C.
having been canceled
D.
have been canceled
【简答题】查找8位编码: 聚氯乙烯制手套( )劳保手套( )塑料或橡胶浸渍的运动手套( )
【单选题】Because of the heavy fog, the TV tower was . [ ]
A.
in sight
B.
lost sight
C.
disappeared
D.
out of sight
【单选题】正如佛里克森所言,民众是政府的“所有者”,而非顾客,“所有者”概念具有主动性,它可以决定政府的议程,更符合人民的地位。对这段文字中“所有者”的正确理解是:
A.
主人
B.
合伙人
C.
监督者
D.
参与者
【简答题】阅读 We regret to inform you that the flight has been delayed because of heavy fog.
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