题干

某校研究学习小组对竹子里的气体成分进行了探究,将从竹子里收集的两瓶气体与两瓶空气进行对照实验.

(1)收集空气的方法:____ 

(2)将点燃的木条伸入两瓶气体,发现木条在竹子里气体中燃烧的旺盛程度比在空气中的要低.该实验可以证明竹子里气体中一定含有____ .

(3)将澄清石灰水同时加入两瓶气体中,空气不能使澄清石灰水变浑浊,竹子里气体能使石灰水变浑浊.该实验证明竹子里气体中含有____ .反应的方程式为____ 

(4)根据以上两个对比实验中的现象,从量的多少方面与空气比较,我们能得出两个结论是:

(1)____ (2)____

上一题 下一题 0.0难度 选择题 更新时间:2017-05-26 03:55:07

答案(点此获取答案解析)

\u5148\u5c06\u7af9\u5b50\u6d78\u5728\u6c34\u91cc\uff0c\u94bb\u4e00\u4e2a\u5c0f\u5b54\uff0c\u770b\u5230\u4e00\u4e32\u4e32\u6c14\u6ce1\u5192\u51fa\uff0c\u7136\u540e\u91c7\u7528\u6392\u6c34\u96c6\u6c14\u6cd5\u6536\u96c6,\u6c27\u6c14,\u4e8c\u6c27\u5316\

同类题5

任务型阅读

    Do you have the experience of digging out your suitcase, deciding what to bring and being afraid that you've forgotten something?____ Hope they can transform the way you pack.

    Keep a Basket Handy

    Do you wait until the last minute to pack? Keep a basket in your bedroom, living room, or bath room that you can use to throw in items you'll need to pack as you come across them.____Besides, you can just put the contents of the basket into your suitcase if you are in a hurry to leave for the airport.

Buy Wrinkle-free Clothing

    You won't need to worry about carefully packing your items of clothing if they're made from wrinkle-free materials.____You'll still look fresh and bright when you are in them at your destination.

    Keep Old Packing Lists

    Chances are that you end up taking trips that require you to pack similar items. Keep old packing lists from former vacations to the beach, ski resort, and city—that way, you'll always have a list of at least the basics.____So you don't need to waste your effort to remember where you left your hand-written packing lists.

    Schedule a Packing Time

    Time can slip away from you before a trip-you may be caught up at work, at home, or be occupied with other responsibilities of daily life.____ That way, you will not need to do your packing frantically (狂乱地) from the last minute to 1 o'clock on the day you leave.

A. This makes you less likely to forget the stuff.

B. The best way to do this is to save them on your computer.

C. Buy necessary stuff when you arrive.

D. Determine a night well in advance of departure to pack.

E. That's why I've distilled (提炼) the art of packing down to some essential tips.

F. Just ball them up or put them at the bottom of the suitcase.

G. Rolling your clothes is the best way to save space for the suitcase.