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【判断题】
无级变速器CVT采用传动带和工作直径可变的主、从动轮相配合传递动力A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】角β终边上一点 的坐标是(3,4),则sinβ=( )
【单选题】What is the 95% confidence interval of coefficient lotsize, if the 97.5% critical value is 1.99 and the 95% critical value is 1.66?
A.
[0.0011,0.0031]
B.
[0.0009,0.0033]
C.
[0.0011, 0.0033]
D.
[0.0009,0.0031]
【简答题】错在哪里？ 1 3 5 ×5+4×1 2 3 +1 2 3 = 1 2 3 ×(5+4) = 1 2 3 ×9 =15 4 2 9 -4 2 9 × 5 6 = 0× 5 6 =0．
【简答题】解比例 5 4 ：X= 你 4 ：6 0.6 tr = t.5 x ．
【判断题】A market researcher computed a confidence interval for a population proportion using a 95% confidence level. Her boss decided that she wanted a 99% confidence level instead. The new interval with 99% ...
A.
正确
B.
错误
【判断题】A 95% confidence interval estimate for a population mean is determined to be 75 to 85. If the confidence level is reduced to 80%, the confidence interval for μ becomes narrower.
A.
正确
B.
错误
【简答题】请简述验证用户的四个文件的功能。
【单选题】The z value associated with a two-sided 95% confidence interval is _______.
A.
1.28
B.
1.5
C.
1.96
D.
2.575
E.
2.33
【简答题】计算：4×（﹣123）+（﹣5）×125﹣127×4﹣75×5．
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