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由于误差本身是可疑的数字,所以表示误差一般取 位。在误差中,对有效数字取舍采用 ,而不用四舍五入法,因为误差是作最坏估计。由于进位会引起附加误差,在整个误差中占的百分比过大时,保留一位有效数字,即误差最多取 位有效数字。
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【简答题】then and now A. I'm going to visit my grandparents. B. The river is not clean. C. There are many cars,too. D. I often went fishing and swam in it. E. there were only some small houses. 阅读下面的对话,将上面的五个句...
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【单选题】The best place to stay for thrifty travelers is______.
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dirty but cheap hostels
B.
cheap houses of students
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clean and safe hostels
D.
hotels with room service
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【简答题】Rabbits are easy to raise. The long-eared animals are clean and quiet. They do not need a lot of room. And you do not have to spend a lot of money to feed them. 小题1: One male and two females will prod...
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【单选题】Floods Water is one of the most useful things on Earth. We drink it, bathe in it, clean with it and use it to cook food. Most of the time, it is completely beneficial to the humans. But in large enoug...
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查看完整题目与答案