题目内容

丁-2-炔在Lindlar催化剂作用下与H2反应产物为

A. 正丁烷
B. 顺-丁-2-烯
C. 反-丁-2-烯
D. 难以确定

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下列炔烃中,在HgSO4-H2SO4的存在下发生水合反应,能得到醛的是

A. 乙炔
B. 丁-2-炔
C. 丙炔
D. 丁-1-炔

某烯烃经臭氧化和还原水解后只得到 CH3COCH3, 则该烯烃为

A. (CH3)2C= C(CH3)2
B. (CH3)2C=CH2
CH3CH=CH2
D. (CH3)2C=CHCH3

The size and location of the world's deserts are always changing.Over millions of years，as climateschange and mountains rise，new dry and wet areas appear. But within the last hundred years，desertshave been increasing at frightful speed. This is partly because of natural changes，but men should beresponsible for creating deserts most.

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