题干

仿用下面两个比喻句的句式,请以“时间”开头,结合自己的感悟,写两个句式相同的比喻句。
        书籍好比一架梯子,它能引导我们登上知识的殿堂。书籍如同一把钥匙,它将帮助我们开启心灵智慧之窗。时间                                                       

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答案(点此获取答案解析)

时间好比一个良医,它能教我们医治流伤的血口。时间如同一位慈母,它将帮助我们抚平心灵的创伤。时间如同一位法官,它对每一个人都是公而无私的。时间好比一支画笔,它在人们的脸上画出了人生的沧桑。(要求比喻恰当)

同类题1

氮及其化合物与我们的吃、穿、住、行、健康等都有着密切的联系,也是高中化学学习中重要的一部分.请回答下列问题:

I.(1)现有一支15mL的试管,充满NO倒置于水槽中,向试管中缓缓通入一定量氧气,当试管内液面稳定时,剩余气体3mL.则通入氧气的体积可能为____ 

(2)一定条件下,某密闭容器中发生反应:4NH3(g)+5O2(g)⇌4NO(g)+6H2O(g).

起始浓度( mol/L)

C(NH3)

C(O2)

C(NO)

C(H2O)

甲

1

2

0

0

乙

4

8

0

0

丙

0.2

x

y

z

①恒温恒容下,平衡时NH3的转化率甲____ 乙.(填“>”、“=”、或“<”)

②恒温恒容下,若要使丙与甲平衡时各组分浓度相同,则x=____ ,y=____ z=____ 

(3)向容积相同、温度分别为T1和T2的两个密闭容器中分别充入等量NO2,发生反应:2NO2(g)⇌N2O4(g)△H<0.恒温恒容下反应相同时间后,分别测定体系中NO2的百分含量分别为a1和a2;已知T1<T2,则a1____ a2.

A.大于    B.小于    C.等于    D.以上都有可能

(4)2.24L(标准状况)氨气被200mL 1mol/L HNO3溶液吸收后,反应后溶液中的离子浓度关系是____ .

Ⅱ.三氟化氮(NF3)是一种新型的电子材料,它在潮湿的空气中与水蒸气能发生氧化还原反应,其生成物有HF、NO、HNO3.根据要求回答下列问题:

(1)写出该反应的化学方程式:____ .反应过程中,氧化剂和还原剂物质的量之比为____ 

(2)若反应中生成0.2mol HNO3,转移的电子数目为____ 

同类题5

根据短文理解,选择正确答案。

    There are many fun, free activities that you can do as a family. All that is required is a bit of imagination and some time set aside for fun. And the best part is that these are the kind of memories a child will remember for a lifetime.

Family game night

    Find out any of the games that are already around the house. Kids often get computer games for Christmas or birthdays, and would love to have a chance to play with their family. Or, make up some games of your own. “Charades” is a fun game to play that will challenge a child to use his/her imagination. Divide the family into teams and let each team come up with words that the other has to act out.

Family art time

    Pick some time for the family to sit down and come up with their own masterpiece. It doesn't need to be just a drawing -- take some old magazines sitting around the house, let the kids cut out pictures and paste them into their own montage. Or, use items from nature. Let them use leaves, pine cones, twigs and whatever else they can find to create something from their imaginations.

Family Picnic

    Taking the family for a picnic is a great way for some fun that doesn't cost any money. If the weather is nice, take them to a park or playground and let the kids have a day of playing. Or, if it is the middle of winter and a foot of snow is on the ground, set up a picnic in the living room.

Family Field Trip

    A family field trip doesn't have to cost a dime. Ask a nearby farm if it would be alright to bring your kids out for a tour and to see some of the animals. Or take them to a park and make a scavenger hunt where they need to find certain items from nature. Ask a local business if you could bring the family for a tour to see how things work -- you might be surprised at the number of people who would be thrilled to share what they do with others, and it could be an interesting lesson for the kids.