下列对甲烷和乙烯的描述正确的是
A.乙烯比甲烷的碳的质量分数低
B.燃烧时,乙烯与甲烷现象一样
C.它们都能使溴水褪色
D.充分燃烧时,产物都是二氧化碳和水
答案:D
下列对甲烷和乙烯的描述正确的是
A.乙烯比甲烷的碳的质量分数低
B.燃烧时,乙烯与甲烷现象一样
C.它们都能使溴水褪色
D.充分燃烧时,产物都是二氧化碳和水
答案:D
Merry Market is 1 big supermarket.It’s very near my home.There 2 many things.There are 3 many people,especially(尤其是)on holidays 4 at weekends.You can 5 food and 6 ,clothes and so on.The shop is open 24 hours every day.The salesmen in the supermarket 7 very nice and 8 . 9 like to talk to you and help you.You can buy things there and you can 10 meals there,too.
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