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【单选题】
A process characteristic has a true mean of 150 and a true standard deviation of 20. A sample of 25 items is taken from this process. The standard error of the estimate is: A . 0.2
B.
. 0.8
C.
. 4
D.
. 5
E.
. 7.5
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参考解析：
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举一反三
【单选题】_____ good care of, the old man is living a happy life.
A.
Taken
B.
Being taken
C.
Taking
D.
To be taken
【单选题】物质A发生两个一级平行反应 设两反应的指前因子相近且与温度无关，若 E1> E2，则有： （）
A.
k1>k2
B.
k2 >k1
C.
k2=k1
D.
无法比较k1，k2的大小
【单选题】Which of the following qualities are possessed by all entrepreneurs?
A.
Having vision and being not afraid to fail.
B.
Being well educated and not afraid to take risks.
C.
Having the ability to see opportunities and having good backgrounds.
D.
Being rich and having the ability to come up with brilliant ideas.