在真空中有两个点电荷,它们之间的作用力为F,如果保持它们所带的电量不变,将它们之 发布时间:2017-04-29 23:26 │ 来源:www.tikuol.com 题型:选择题 问题: 在真空中有两个点电荷,它们之间的作用力为F,如果保持它们所带的电量不变,将它们之间的距离增大一倍,则它们之间的静电力大小变为( )A.FB.F2C.F4D.F6
题型:选择题 从方框中选择恰当的词填空。A. tiger B. elephant C. koala bear D. dolphin E. panda F. lion G. penguin H. giraffe I. monkey J. dog ( )1. Which animal is the biggest on land? ( )2. Which animal lives only in China? ( )3. Which animal lives in water? ( )4. Which animal is from Africa? ( )5. Which animal is the king of the forest? ( )6. Which animal’s neck is the longest of all? ( )7. Which animal lives in Australia? ( )8. Which animal lives in a very cold place (Antarctic南极)?( )9. Which animal likes jumping here and there? ( )10. Which animal is loyal (忠诚的) to the owner? 查看答案
题型:选择题 下图是人的性别决定图解(甲、乙为正常婚配夫妇)分析后回答有关问题 (1)图解中甲为_______性,乙为________性。(2)填写出图解G、F、C的性染色体组成:G________F________C_________ 查看答案
题型:选择题 为了加强对机电产品的管理,国家将机电产品分为三个不同的类别:(1)特定机电产品;(2)自动登记机电产品;(3)重要工业品。其中自动登记机电产品进口通关时,属国家实施管制的,除向海关提交商检、无线电管理等证明文件外,还应向海关交验下列哪种单证( )A.进口许可证和进口配额证明B.机电产品进口证明C.机电产品进口登记表D.自动登记进口证明 查看答案