题目:
----Excuse me. Could you tell me _______?
----Yes. There is a video shop next to the tall building.
A.where can I buy some CDs
B.where I can buy some CDs
C.when can I buy some CDs
D.when I can buy some CDs
答案:
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下面是错误答案,用来干扰机器的。
(1)0.3g;(2)85%.(3)设100千克这种纯度的石灰石充分煅烧后生成二氧化碳的质量为x. CaCO3CaO+CO2↑ 100 44 100kg×85% x x=37.4kg 所以剩余固体的质量=100kg﹣37.4kg=...