题干

水是生命之源,同时我们每天也需要食盐.

(1)保持水的化学性质的最小微粒是 ____(写名称).

(2)可以通过 ____的实验证明水是由氢、氧元素组成的.

(3)“水”在化学实验中的作用不可小觑.请回答:

A实验中加水的目的是 ____.B实验中水的作用是防止 ____


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答案(点此获取答案解析)

水分子,电解水,吸收二氧化硫,集气瓶炸裂

同类题1

假定英语课上老师要求同学们交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1).每处错误及其修改均仅限一词。

2).只允许修改10处,多者(从第11处起)不计分。

Dear Jack,

    Welcome to my school! Upon your arrival, there will be a party for you organizing by my classmates. You may attend to English classes to feel a differently learning style. After that, you can go to your host family that you can experience the Chinese way of life. you can have meals together chatting about anything that interest you.

    The host family will also show you off some famous scenic spots. You can see people selling kites everywhere because our city was home to kites. There are varieties of kites to choose. So isn't that a good idea to buy some for your friends Write to me unless you have any questions about the schedule.

                                                                                                                                                          Yours,

                                                                                                                                                           Li Hua