在下列四个方程中,X1、X2、X3和X4各代表某种粒子,以下判断中正确的是( ) 发布时间:2017-08-07 09:00 │ 来源:www.tikuol.com 题型:选择题 问题: 在下列四个方程中,X1、X2、X3和X4各代表某种粒子,以下判断中正确的是( )+→++3X1,→+X2,→+X3,→+X4.A.X1是α粒子B.X2是质子C.X3是中子D.X4是电子
题型:选择题 识图题(1)图中人物是谁?生活在什么时期?___________________________________________________________________________________________(2)他的思想主张有哪些?___________________________________________________________________________________________(3)他有哪些主要成就?___________________________________________________________________________________________(4)他的思想对后世有什么影响?___________________________________________________________________________________________ 查看答案
题型:选择题 用下列单词的适当形式填空。be accustomed to, lay off, suspect sb.of doing , set about, as a whole, spit at, to start with, add up to, swell with, keep pace with1. It's impolite to others. Besides, it may result in conflicts. 2. The young should the times, or they'll fall behind others. 3. The bills 100 dollars, which I can't afford. 4. Never pride when you have made some contributions. 5. I getting up early. 6. He told the boys to making noises. 7. The manager him offering false information. 8. The boy studying at once made his parents happy. 9. He won't win the match. he lacked experience. 10. His property was sold , so now he has nothing. 查看答案
题型:选择题 跑道中线灯颜色为红白相间的一段是:().A.从跑道入口到跑道末端B.从跑道入口后300米到至跑道入口900米C.从距跑道末端900米到距跑道末端300米D.从距跑道入口900米到距跑道入口300米 查看答案