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问题 单项选择题

实际营运中，船舶纵向移动载荷调整吃水差，已知t＝-1.130m，则由中部舱室向首部舱室移货时，尾吃水差将（）。

A.增大

B.减小

C.不变

D.变化趋势不定

答案

参考答案：B

选择题

小芳对校园生物进行调查时，将6种动物进行如下表的简单分类，她的分类依据是

A．水生还是陆生

B．是否能飞行

C．体内有无脊椎骨

D．体温是否恒定
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单项选择题

A researcher is testing whether the average age of employees in a large firm is statistically different from 35 years ( either above or below). A sample is drawn of 250 employees and the researcher determines that the appropriate critical value for the test statistic is 1.96. The value of the computed test statistic is 4.35. Given this information, which of the following statements is FALSE The test:（）

A. is two- tailed.

B. indicates that the researcher will reject the null hypothesis.

C. has a significance level of 95%.
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