短周期元素的离子aXm+
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短周期元素的离子aXm+、bYn+、cZn﹣和dWm﹣具有相同的电子层结构，若m＞n，下列叙述正确的是（ ）
①元素的原子序数：a＞b＞c＞d ②a﹣b=n﹣m
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硒(Se)是第4周期ⅥA族元素，下列叙述不正确的是
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1.To be honest is to be true (to) oneself.2.Some people find the new technology makes theatre less b...习题大全 1天前 -
英语题（用介词、副词填空）1.To be honest is to be trueoneself.2.Some people find the new technology makes theatre less believable,less truetheir own experience and therefore less convincing than the performances seen on television and cinema.3.Teachers areshort supply,and as a result,education has become more expensive.4.Gasoline wasshort supply after the war.5.Medicines areshort supply; diseases are spreading quickly.6.The point of his speech is that we should standfreedom.7.These people say that they standpeace,love,liberty,and human responsibility.8.Very soon a letter arrived from Beijing in responsean old man's inquiries about his elder son who is still alive and lives not far from the capital.9.A child's responsedeath will vary in accordance with age.10.Sorry,you're just a few linksfrom the website that you want to go to.11.A senior official from the university said that they were trying their best to transform their universitya top school in the country.12.When they had learned the whole story from beginning to end their surprise was transformedexcitement.13.Realizing that the end of his career was nearhand,he looked for some additional income.14.The accident happened in a place far away from cities and hospitals were not nearhand; that's why some people died just because of bleeding.15.Could I have accessyour central computer for a while?16.The poor people in the country have accessneither educational nor political resources.17.Carmen yieldedgeneral pressure and unwillingly took the child to a specialist.18.I think eventually politics is going to yieldthe need for disaster relief for individuals and communities that need it.19.If you engagepolitical affairs,you cannot expect to have much time for your family.20.I have a large circle of friends and acquaintances engagedphotography.
1.To be honest is to be true (to) oneself.2.Some people find the new technology makes theatre less b...习题大全 1天前 -
so much \so many \suchmuch\such\many的区别和用法so many和such many 都加形容词时，有什么区别吗
so many用来修饰可数名词,so much用来修饰不可数名词,这两个词组通常与that连用.There was so much noise outside that we couldn\'t he...习题大全 1天前