下列反应的化学方程式书写完全正确的是_刷题宝

题干

下列反应的化学方程式书写完全正确的是（）

A：铁在氧气中燃烧：2Fe+3O₂ $\frac{\underline{点燃}}{}$ 2Fe₂O₃

B：盐酸除铁锈：Fe₂O₃+6HCl=2FeCl₃+3H₂O

C：密闭容器中燃烧红磷验证质量守恒定律：2P+O₂ $\frac{\underline{点燃}}{}$ P₂O₅

D：甲烷燃烧：CH₄+O₂=CO₂+H₂O

上一题下一题 0.0难度选择题更新时间:2019-04-22 06:45:07

答案(点此获取答案解析）

B

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在四线三格上抄写单词。____

skirt jacket sweater raincoat show help try on

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列举你发现的五种动物。

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补全对话

A. We Chinese usually eat rice dumplings this day.

B. I hate eating rice dumplings.

C. Thank you for your rice dumpling.

D. I don't think so.

E. Would you like to have one?

F. Already?

G. How about you?

A: What's the date today?

B: It's June 2^nd.

A: ____ Then it's Dragon Boat Festival today, isn't it?

B: Yes. ____

A: Did you have rice dumplings this morning?

B: Sure. ____

A: I didn't.

B: What a pity! But I happen to have got some with me. ____.

A: I'd love to. By the way, why do you call it Dragon Boat Festival?

B: Because in China, people race dragon boats this day every year.

A: Oh, I see. ____

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如图是无废弃物农业生态系统示意图，下列有关分析错误的是（）

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有个偷针者和偷牛者一起被游街，偷针的觉得很委屈：“我只偷了一根针，为什么要和盗牛贼一起游街，太不公平了！”盗牛贼却对他说，“别嚷了，我走到这一步也是从偷针开始的。”这一寓言故事告诉我们
①事物的质变是由渐进的量变引起的 ②事物的任何量变必然引起质变
③事物的质变是量变的基础 ④事物根本性质的变化是量变

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