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【判断题】
在进行区间估计时，置信水平定得越高，则估计的精确性就越低。（）A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】Many of us don’t like what we see around us but the last thing we do is to change it. I think that is the beginning of failure and that is why what we hate remains around us. If you don’t want to see ...
【单选题】I think humour is a vital form of entertainment, ____ it makes us laugh and laughing keeps us healthy.
A.
when
B.
after
C.
if
D.
because
【单选题】I wonder if she______us,but I think if she______us we will be able to complete the task ahead of time.
A.
helps;helps
B.
will help;has helped
C.
helps;will help
D.
will help;helps
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