某炔烃经催化加氢后,得到2-甲基丁烷,该炔烃是 A.2-甲基-1-丁炔 B.2- 发布时间:2017-05-25 23:26 │ 来源:www.tikuol.com 题型:选择题 问题: 某炔烃经催化加氢后,得到2-甲基丁烷,该炔烃是A.2-甲基-1-丁炔B.2-甲基-3-丁炔C.3-甲基-1-丁炔D.3-甲基-2-丁炔
题型:选择题 短文改错。此题要求改正所给文中的错误。对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正: 此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。 此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。 此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。 注意:原行没有错的不要改。 There are thousand of languages in the world. English is one of world's most widely used language. It is spoken by nearly three hundred million of people in the United States, England and so on. As the second language, English was often necessary for business, informations and many other things in a lot of countries like Indian. It is also one of the working languges on the United Nations and is more used as the others. 1___________ 2___________ 3___________ 4___________ 5___________ 6___________ 7___________ 8___________ 9___________ 10___________ 查看答案
题型:选择题 患儿男,10个月,因“腹泻6个月”来诊。排粪6~7次/d,呈黏液脓血样,间发热。实验室检查:ESR87mm/h。结肠镜检查:直肠、乙状结肠、降结肠、升结肠黏膜多发浅溃疡,充血、水肿。首选药物是()A.5-氨基水杨酸B.甲硝唑保留灌肠C.氢化可的松保留灌肠D.泼尼松E.柳氮磺胺吡啶 查看答案