用数形结合的方法表示某些化学知识直观、简明、易记。下列用数轴表示正确的是_刷题宝

题干

用数形结合的方法表示某些化学知识直观、简明、易记。下列用数轴表示正确的是（）

A：不同物质的着火点：

B：硫及其化合物与化合价的关系：

C：50g19.6%的稀硫酸与足量金属反应产生氢气的质量：

D：物质形成溶液的pH:

上一题下一题 0.0难度选择题更新时间:2015-07-24 05:23:14

答案(点此获取答案解析）

B

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物理小组制作的潜水艇模型如图所示

.

通过胶管A从烧瓶中抽气或向烧瓶中打气，可使烧瓶下沉、上浮或悬浮

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当烧瓶处于如图所示的悬浮状态时，若用打气筒向烧瓶里打气，烧瓶将会（）

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为双曲线C：

的左、右焦点，点P在C上，∠

，则P到x轴的距离为

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关于动物内环境稳态的叙述，错误的是（）

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阅读下面短文，然后根据括号内所给汉语意思写出单词的正确形式（每空一词）。

Last weekend I went to visit my grandma. ____ (虽然) her house is far from mine, I still decided to walk there. It was very sunny so I didn't take my ____ (雨伞). However, on the way it began to rain hard. And soon I was all ____(湿的). When I was thinking about what to do next, ____ (幸运地), there came a taxi. I ____ (停) it and went into it quickly. When I arrived at my grandma's house, she was very surprised to see me.

"Is it ____ (必要的) for you to come here on foot? Why didn't you drive your car here?" She asked.

"Because I want to take more exercise." I answered.

"Why did you come on ____ (这样的) a rainy day?"

"I came to tell you a piece of good news."

"What good news?"

"I ____(赢) the first prize in the singing ____ (比赛)."

"Congratulations!" said my grandma excitedly, then she ____ (给) me a warm blanket to wrap me.

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