您所在的当前位置：初中物理试题 >

速度与机械运动

> 某同学对一些物理量进行了估测，其中最接近实际的是 A.某初中生的身高为175cm B.人体正常体温约为41℃ C.初中学生书桌高约300mm D.正常人步行速度约为6m/s

问题：

发布时间：2024-09-12

某同学对一些物理量进行了估测，其中最接近实际的是

A.某初中生的身高为175cm
B.人体正常体温约为41℃
C.初中学生书桌高约300mm
D.正常人步行速度约为6m/s

参考答案：

提问用户：5t***l9a

可能感兴趣的题目：

1 读黄河流域图，回答问题。小题1:甲湖泊面积不断缩小，要及时获取湖泊面积变化情况，最快捷的途径是 A．借助RS技术 B．借助GPS技术 C．借助GIS技术 D．实地考察小题2:图中乙、丙、丁三地主要的环境问题分别是 A．气候干旱、洪涝灾害、生物多样性减少 B．酸雨、水土流失、赤潮 C．荒漠化、水土流失、海洋污染 D．水土流失、荒漠化、泥沙淤积
2 某学生做如下实验：第一步，在淀粉KI溶液中，滴入少量NaClO溶液，并加入少量稀硫酸，溶液立即变蓝；第二步，在上述蓝色溶液中，滴加足量的Na 2SO 3溶液，蓝色逐渐消失。下列叙述中该同学对实验原理的解释和所得结论不正确的是 A．氧化性：ClO－>I2>SO42- B．淀粉KI溶液变蓝是因为I－被ClO－氧化为I2，I2遇淀粉变蓝 C．蓝色消失的原因是Na2SO3溶液具有漂白性 D．若将Na2SO3溶液加入氯水中，氯水褪色
3 肖华是一名发育正常的初中生，下列有关他的一些数据符合实际的是 A.身高1.65m B.质量50g C.体温20℃ D.步行速度5m/s
4 阅读理解。 Two years ago my grandmother was going to turn 75. My family discussed what was the best way to celebrate. Should we throw her a party ? Should we take her on a trip ? We remembered that she had touched so many people"s lives, and there were so many people for her to consider. Then someone got the idea that we should include everyone in the celebration by turning it into a tribute (献礼) to my grandmother. We secretly sent out letters to the people in Grandmother"s address book and asked them to send a letter with a memory that they had shared with her. People sent us letters with poems, stories and pictures. The deep feeling that was shared through the response (回应) surprised us. We compiled (编辑) these letters into a memory book and amazed her with it on the morning of her birthday. The unusual thing about my grandmother"s friends was not the number that she had, but the connection they shared. In many ways this book of friendship was the greatest achievement of my grandmother"s life. I believe that developing true friendships is one of the most important things that anyone can do in one"s lifetime. It is not a matter of the number of friends one has, but the quality of the bonds. If one has had at least one true friendship before dying, then one can say one has lived a successful life. I have made many friends and I believe I have begun to develop the same types of friendships my grandmother kept up over her lifetime. I only hope that I will be as successful as she has been. 1. How did the author"s family celebrate Grandmother"s birthday ? A. They took her on a trip across the country. B. They gave her a memory book of friendship. C. They invited all her friends to her birthday party. D. They asked all her friends to send her cards. 2. When receiving her birthday gift, the author"s grandmother probably felt _____. A. disappointed and lonely B. sorry and sad C. surprised and pleased D. nervous and excited 3. According to the passage, the author probably agrees that _____. A. the more friends you have, the better B. friends are more important than family C. understanding leads to greater success D. true friendship is very important to us 4. Which of the following words can best describe the author"s grandmother ? A. Kind. B. Great. C. Polite D. Pleasant
5 质量为2 kg的物体，以4 m/s的初速度竖直向上抛，不计空气阻力，求物体抛出时和落回抛出点时的动量及这段时间内动量的变化.
6 It was Tom ________ is a soldier ________ saved the little girl from the water yesterday. A．that；that B．whose；whom C．who；who　 D．that；who
7 汽车由静止开始在平直的公路上行驶，0～50s内汽车的加速度随时间变化的图线如图所示。下面的有关说法正确的是 A．汽车的行驶的最大速度为20m/s B．汽车在40～50s内的速度方向和在0～10s内的速度方向相反 C．汽车在50s末的速度为零 D．在0～50s内汽车行驶的总位移为900m
8 已知向量 .（1）若 ,求的值；（2）记，在△ ABC中，角 A， B， C的对边分别是 a, b, c，且满足（2 a- c）cos B= bcos C，求函数 f( A)的取值范围.
9 ______ is the number of the people who speak English? A.How many B.How much C.How D.What
10 氯化溴是由两种卤素互相结合而成的卤素互化物。其化学性质与Cl 2相似，能与金属和非金属反应生成卤化物，能与水反应：BrCl+H 2O HCl+HBrO，下列有关BrCl的性质的叙述中不正确的是 A．BrCl和NaOH溶液反应生成NaCl、NaBrO两种盐 B．BrCl具有较强的氧化性 C．能使润湿的淀粉碘化钾试纸变蓝 D．BrCl与水反应中，BrCl既是氧化剂又是还原剂