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问题 单项选择题

设一次试验成功的概率为p，进行100次独立重复试验，当p=（）时，成功次数的方差的值最大，其最大值为（）

A.1/2，25

B.1/2，50

C.1/2，5

D.1/4，25

E.1/4，5

答案

参考答案：A

改错题

There are several ways improve our English writing skills, such as keeping a diary, learning any good writings by heart, doing a lot of reading, etc. As for me, I prefer keeping a diary. Comparing with other forms of writing, keeping a diary is easy and take less time. In addition, they can help us form the habit of thinking in English. If we can keep this practice, and we will gradually learn how to express us in English. What’s more, keeping a diary can be as talking with one of our close friend, sharing our happiness or sadness. In the word, keeping a diary is a good way of improving our written English.
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单项选择题

CBM数据库现使用哪个字符作为任意通配符进行通配检索？（）

A、*

B、or

C、%

D、$
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