来自刘革兴的问题
塑料饮用瓶的形状包含了哪些科学道理?
塑料饮用瓶的形状包含了哪些科学道理?
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2019-12-04 11:19
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陈世国
弧形结构的部位最不容易使塑料瓶变形.
美观、容易生产、方便使用,等等.
2019-12-04 11:24:01
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