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问题 填空题

写出表示颜色的词语。

黄　_______　_______　红　_______　_______　绿　_______　_______　蓝　_______　_______

答案

金黄　杏黄　火红　粉红　嫩绿　翠绿　宝石蓝　碧蓝

（答案不唯一）

单项选择题

In a two - tailed hypothesis test, Jack Olson observes a t - statistic of -1.38 based on a sample of 20 observations where the population mean is zero. If you choose a 5 percent significance level, you should:（）

A. reject the null hypothesis and conclude that the population mean is significantly different from zero.

B. fail to reject the null hypothesis that the population mean is not significantly different from zero.

C. reject the null hypothesis and conclude that the population mean is not significantly different from zero.
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单项选择题

碳弧气刨时，选择碳棒的直径应比所要求的刨槽宽度小约( )。

A．2mm

B．4mm

C．5mm

D．6mm
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