问题
问答题 简答题
偶然误差的特性是什么？
答案
参考答案：
偶然误差有以下几个特性：
1、一定的观测条件下，偶然误差的绝对值不会超过一定的限值。
2、值较小的误差比绝对值较大的误差出现的机会多。
3、值相等的正误差与负误差出现的机会相等。
4、误差的算术平均值，随着观测次数的无限增加趋向于零。
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偶然误差的特性是什么？
参考答案：
偶然误差有以下几个特性：
1、一定的观测条件下，偶然误差的绝对值不会超过一定的限值。
2、值较小的误差比绝对值较大的误差出现的机会多。
3、值相等的正误差与负误差出现的机会相等。
4、误差的算术平均值，随着观测次数的无限增加趋向于零。
Jill and Jenny were the best of friends. They were_ so much of the time that people said that they were like twins. They did _ __ and went everywhere together. One day, however, something that_ __ caused their friendship to break happened. Jill had already made plans with Jenny to watch a(n) _ _ . At the last minute, Jill’s mother had an errand （差事）to run and Jill__ __ look after her sister. Jenny was disappointed(失望的) but said that she would still_ _ Jill and watch the show together. The next morning, Jill overheard Jenny telling another friend,“I watched it last night. It was a wonderful show.” Jill got _ _ .She walked past Jenny and gave her a cold look. Jenny __ _why Jill was so angry with her. When Jenny called out to Jill, she ignored(不理) her. After school, Jenny waited for Jill, __ __, for their walk home together. However, Jill just_ __ on alone. Jenny ran after her and asked,“What’s the matter, Jill? Why are you avoiding __ __ like this?” Jill answered angrily,“You broke your _ _ . A good friend should not do that.” Jenny realised what the _ _ was and laughed. “I didn’t go to the show. I just watched another show on TV. I will _ _ break my promise to you. You are my best friend.” Jill said _ _ to Jenny and they were the best friends again.
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