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【单选题】
在一元线性回归分析中,关于最乘估计的性质正确的是( ).A.
;
B.
;
C.
设 分别为总的离差平方和、残差平方与回归平方和,则有 ;
D.
是 的无偏估计量.
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举一反三
【单选题】What happened to Alex Winston when she was in New York?
A.
She was terribly sick.
B.
She wrote songs with a guitar.
C.
She felt excited about everything.
D.
She went through a tedious time.
【单选题】Although she wrote a lot of short stories and poems when she was very young, ______ she was twenty five.
A.
her first real success did not come until
B.
her real first success came until not
C.
since her first real success did not come until
D.
not until her first real success
【简答题】She often wrote him ______ letters in her spare time. (friend)
【多选题】申请人有以下哪些情形之一的，不予颁发律师执业证书。()
A.
无民事行为能力或者限制民事行为能力的
B.
被开除公职的
C.
受过刑事处罚的，但过失犯罪的除外
D.
被吊销律师执业证书的
【多选题】不得颁发导游证的情形包括( )．
A.
无民事行为能力或者限制民事行为能力的人员
B.
患有传染性疾病的人员
C.
受过刑事处分的人员，过失犯罪的人员除外
D.
被吊销导游证的人员
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