题目内容
在曲线弧长相等的情况下,切线转过的角度越大,曲线的曲率就越大。
查看答案
搜索结果不匹配？点我反馈
更多问题
在切线转过的角度相同的情况下,曲线的弧长越大,曲率就越大。
曲线在M点处曲率圆的曲率与曲线在M点处的曲率相等。
我们可以用以下哪些信息比较准确的描绘函数图像
选词填空Directions:In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.The secret to happiness is keeping busy, research has found. Keeping the mind __ 26__with tasks-no matter how meaningless-staves off(赶走) negative emotions, the study found.However, the bad news is that humans seem hard-wired (天生的) to be lazy in order to save energy, according to Professor Christopher Hsee, a behavioral scientist at Chicago University.In a study 98 students were asked to complete two surveys. After they had completed the first they were made to wait 15 minutes to receive the next one. They were given a choice of either handing in the first __ 27__nearby or at a more distant location they had to walk to. Whichever option they chose, they received a chocolate bar. Two- thirds (68 per cent) chose the lazy __ 28__. Those who had taken the walk reported feeling happier than those who bad stayed __ 29__.Prof Hsee __ 30__keeping busy helped keep people happy. He said the findings, reported in the journal Psychological Science, had policy__31__"Governments may increase the happiness of idle citizens by having them build bridges that are __ 32__useless," he proposed. At the individual Ievel, he advised, "Get up and do something. Anything. Even if there really is no point to what you are doing, you will feel better for it. " He __33__, "Incidentally, thinking deeply or engaging in self-reflection __ 34__as keeping busy, too. You do not need to be running around--you just need to be __ 35__, either physically or mentally. "A.studyB. addedC. thoughtD. optionE. engagedF. especiallyG. increasedH. implicationsI. surveyJ. solutionsK. occupiedL. concludedM. countsN. putO. actually
微信支付 
支付宝支付