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如何用塑料自制齒輪

手里有一把鋸子，一個(gè)電烙鐵，10元錢(qián)，和圓規(guī)，鉛筆尺子，如何完成制作一個(gè)馬達(dá)電機(jī)范圍內(nèi)的齒輪（10mm-100mm)?: 問(wèn) 提問(wèn)者：網(wǎng)友 | 2017-05-31

最佳回答

I am a small plastic, our family color colourful, there are red, yellow,..., shape is different also, have seen, rectangle, but most of the heart back. The large size, can be installed on a quilt, small can mount a hairpin. We can be more advantages of convenient, quick, clean, also waterproof. People like me, so I figure everywhere, supermarket, CaiChang, shop...... anyhow, I and peoples life, we can. But someday, people say we are ""killer"" say this environment can be long: when we finished mission, people would put us throw away. The wind blows, sometimes to fly on the trees, and sometimes wafted to fly into the river, we eat fish turtle, resulting in death, sometimes to fly in the soil, two hundred years to decay, and the environment, the influence of the soil, the plant also cannot breathe normally again on this land. I wish people would stop by me, baskets, environmental protection bags. To protect our earth, to protect our homeland! Comments: the composition teacher use is the personification writing technique, """" human emotions and gives, and use the thinking way of writing, the first person to write the composition and content can be closer to the reader, let the reader will pay more attention to the"" I ""- fate. ""I"" composition through readme tell everyone, ""I"" have advantages but more fatal flaw, if you wish to their homes are beautiful, he must not only convenient, let ""I"" into the environment of the killer. The young writer composition, let my heart was born with the convenience of using plastic bags and rejoice, and now has become a big problem of environmental pollution. ""Bags"" itself is not wrong, wrong is that we make it, use it. I believe that the young writer at the composition of the readers, will use plastic bags ""this matter, have oneself more reflection and awakening 這樣行不: 回答者：網(wǎng)友

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