等质量的CuO和MgO粉末分别溶于相同体积的足量硝酸中，得到的Cu(NO3)2和Mg(NO3)2溶液的浓度分别为amol·L－1和bmol·L

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等质量的CuO和MgO粉末分别溶于相同体积

的足量硝酸中，得到的Cu(NO₃)₂和Mg(NO₃)₂溶液的浓度分别为amol·L^－1和bmol· L^－1（忽略溶液体积变化）。则a与b的关系为

A：a='b'

B：a='2b'

C：2a='b'

D：无法确定

上一题下一题 0.0难度选择题更新时间:2016-06-30 06:58:41

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C

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It is Sunday today. Anna goes shopping with her mother. She wants her mother to buy a new coat for her. In Hongxing Shop, she finds a green coat. She tries it on. It's too small. She wants a big one, but the big one is not green. Anna doesn't like other colors.” Let's go to another(另外的) shop to have a look.”her mother says. Then they go to Jiajiale Shop. The shop is big and they see many kinds of coats in different colors and sizes(尺码). Anna tries on a green one. It looks nice on her. So they take it for forty-five yuan.


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