摘要: Electron detachment cross sections for the He- and H- ions in hydrogen, helium and argon have been determined in the energy range 4-30 keV. While cross sections for He- impact are larger than the corresponding cross sections for H- impact, a similar energy dependence is observed....
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He's looking at the sun.他正在看太阳。 look at the picture 看图片 talk about the picture 谈论图片 stand 站立 sit 坐;坐下 Just write写一写 Can you write them?你会写吗? look at the picture 看图片 talk about...
17.下面列出的是一些核反应方程中:30151530P→30141430Si+X,9449Be+2112H→105510B+Y,4224He+4224He→7337Li+Z.其中( ) A.X是正电子,Y是中子,Z是质子B.X是质子,Y是中子,Z是正电子 C.X是正电子,Y是质子,Z是中子D.X是中子,Y是正电子,Z是质子 ...
30道单词组句【急】1.will,kilogrammes,heavier,be,five,he2.in,the,turn,summer,days,longer3.weill,be,jams,fewer,traffic,there4.ferry,to,goes,school,every,by,he,day5.money,collected,he,from,passengers,the6.for,what,you,it,do,use7.scissors,cut,we,things,with8.This,ship,Kate's,new,is,...
阅读理解。 Do you want to know something about NBA stars?Now let me tell you something about Kobe's day.Kobe gets up at 4∶30 in the morning.Then he does morning exercises(早操).At
【题目】He didn’t make ___ clear when and where the meeting would be held. A.this B.that C.it D.These 试题答案 在线课程 【答案】C 【解析】 试题分析:考察固定短语。固定短语Make it clear的意思是“把话说清楚”。常常用在第二人称“你”之后,表示从对方的语言中听出了某些非善意的言外之意...
1. He doesn't go to school at 7: 30. 2. Lingling doesn't have lunch at school. 3. Tom doesn't like swimming. 4. He doesn't often watch TV in the evening. 练习册系列答案 西城学科专项测试系列答案 小考必做系列答案 小考实战系列答案 ...
Peter gets up at 6:00 a.m.. After that , he brushes his teeth and takes a shower , and then has breakfast.At 7:30 a.m. , he takes the school bus to school. It takes him about 10 minutes. He gets home at 4:20 p.m. and does his homework at ...
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