化简比.(1)7238(2)3厘米:6毫米.

题型:解答题

问题:

化简比.
(1)
72
38

(2)3厘米:6毫米.
考点:约分,通分,最简分数,分数的化简
题型:解答题

按要求从H、N、O、K四种元素中,选择适当元素组成物质,用其化学式填空:

(1)可作清洁燃料的单质是______;(2)农业上作复合肥料的是______.

题型:解答题

如图1是一实验电路图,如图2是电路中白炽灯L的U-I特性曲线,R2为定值电阻.在滑动触头由a端滑向b端的过程中(  )

A.路端电压变小

B.电流表的示数变大

C.电源内阻消耗的功率变小

D.电路的总电阻变大

题型:解答题

While I was in 9th grade, I built a circuit (电路装置) for the traffic system of our city. After getting the first prize, I got this valuable advice from my father: “Do whatever interests you, and don’t let the work challenge you, make sure you are challenging that work.” 

I have always preferred the projects which are challenging and related to real life problems. I clearly remember building a shipping program several years ago. I divided the whole project into several small sections. When I understood it clearly, I used my brainstorming skill on it, and gave some basic ideas. Then I asked my professor for help before jumping into coding (编码). At first, I did not know how to ask questions correctly and always asked the question “How do I do it?” As I kept working and discussed with my professor, I became more comfortable and those “how” questions soon turned into “what if I do this and that” types of questions.

It took me four days to write the code. The desire to solve the problem kept me sleepless all nights brainstorming in even greater details. Every time I saw my program running smoothly, I exploded with joy. I still remember the last day of my work. I was getting some problem and didn’t know what to do. At that moment, a man came in to clean. He had headphones, and he was dancing while cleaning the room. Seeing this, I burst out laughing. That moment calmed me. I regained energy and interest and started to work again, and soon I fixed the problem. 

My success in the project proved that breaking up a large problem into small parts could help find a possible solution. Discussing the problem with others was also very beneficial. Now I have gained the confidence to attempt any kind of project. 

小题1:According to the passage, the writer was interested in ______.

A.developing traffic systems

B.doing challenging projects

C.winning great prizes

D.writing different codes小题2: The writer asked the question “how do I do it” at first because ______.

A.he had no clear idea about his program

B.he was too shy to express himself

C.he wanted to be understood easily

D.he preferred this kind of question小题3: We learn from the passage that the writer’s shipping program ______.

A.would benefit people a lot

B.was done together with others

C.was difficult and needed patience

D.cost much money and energy小题4: What would be the best title for the passage?

A.Do It Yourself

B.No Pains, No Gains

C.Learning with Interest

D.Practice Makes Perfect

题型:解答题

被子植物的芽有多种类型,按它们在枝上的位置分成()

A.枝芽、花芽和混合芽

B.活动芽与体眠芽

C.顶芽和腋芽

D.鳞芽和裸芽

题型:解答题

常用的软件开发方法有 ______ 、 ______ 、 ______ 和 ______ 。

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