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90－9×8=____

上一题下一题 0.0难度选择题更新时间:2017-01-17 01:55:17

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18

同类题1

3g镁在氧气中燃烧，可以生成多少克氧化镁？

同类题2

小明做了一个名为“覆水可收”的兴趣实验．他将蜡烛粘在盘子的底部，向盘子中加入

适量水，点燃蜡烛后，将玻璃杯倒扣在盘子中（如图所示）．玻璃杯倒扣在盘子中后，

相关分析不正确的是（）

同类题3

下列句子中，没有语病的一项是（　）

同类题4

A survey was made about what to do if there was a fire. These are some of the replies.

First name: Emily State or province: Illinois Country: USA
Stay low, close to the ground and make your way outside. Then call the local emergency(急救)number from your neighbor's house. This is the most important thing to do. Then wait for the firefighters(消防队员).

First name: Vanessa State or province: Texas Country: USA
If there was a fire and I was in the shower, the first thing I would do would be to make all my clothes really wet and put them on. Then I would break the window with something and get out. If I couldn't do that, I would lie down and leave the water running.

First name: Kystina State or province: Illinois Country: USA
I've never actually been in a fire, but I know what to do. Sometimes at school we have fire drills so that we know what to do if there is a real fire.

First name: Henry State or province: Alaska Country: USA
I would do what they did in the Great Fire, even though it did not happen in the real life. It was a very exciting story.

同类题5

下列知识归纳中，完全正确的一组是（　　）

①绿色植物呼吸作用时吸收CO₂，放出O₂②C、CO、CO₂都具有还原性

③H₂、CO、CH₄燃烧时会放出大量的热，都可以做燃料电池的燃料，

④金刚石、石墨、C₆₀都是碳原子构成的单质 ⑤进入陌生溶洞前﹣﹣先做灯火实验．

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