下列关于误差的说法中,正确的是( )
A:误差是未遵守操作规程产生的
B:只要有精密的测量仪器,认真测量,可避免误差
C:多次测量取平均值可减小误差
D:误差是实验中产生的错误
案例分析:初中生小健、小青、小强课后经常聚在一起下棋、打扑克,开始是谁输谁请客,后来感到不够刺激,就约定谁输谁给钱。他们还一起上网吧,到营业性舞厅跳舞,夜不归宿,对老师和家长的教育置若罔闻。为了满足赌博和高消费的需求,他们先后多次到同学家里及商场行窃,共窃得现金六千多元和价值三千多元的财物。后来他们在一个商场行窃时,被保安人员当场抓获,扭送到派出所。
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Do you kow that animals have love for each other and their children just like us humans? Let me tell you some moving stories of great animal parents. Several years ago a heavy rain hit a town and made the river go up. When the rain stopped, people found that a dog swam to an island in the river twice a day for two weeks. Why did she do so? Her four children were there. The mother swam there every day to feed her babies. This true story moved many people. Another story is about chimpanzees(猩猩). A scientist named Jane Goodall spent 4 years living with chimpanzees in Africa. She found that chimpanzees also cared for those that were hurt or got lost. “It is not only humans who have duties, animals also do,” she said. Two birds in Chengdu also showed their parental(父母的) love. Their baby was hurt and fell on the street in the center of the city. Cars were driving past but the brave parents rushed down to the road and took the little bird away with their claws(爪子).