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下列分子中,所有原子均在同一平面的是
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Dear Professor Dannie,Please allow me to （1） __________________ （介绍我的朋友）, Li Mei, to you. She is applying for admission to your university now and I believe she will achieve a lot if she is accepted by the major of （2） _____________________ (国际贸易) in your college. Miss. Li is good at English and she has passed IELTS and （3） _________________(他的总分是7分). And any testing mark is more than 6, which means she satisfies all the foreign language requirements. She is a （4） __________________________ (诚实、勤劳) young student.Thank you very much for your consideration. My friend and I （5） _____________________________ (盼望您的回信) soon.Yours truly,Li Shu
The first automobile was invented more than 200 years ago. It used steam for power and had woodenswheels. The first automobile may have been simple and primitive,but it was an extremely importantinvention. The automobile today is the primary means of land transportation. It has produced morechanges in our daily life than any other machine.
下面关于烯烃与卤素的反应说法错误的是
1.阻断H2受体的抗消化性溃疡药是()
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