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shiyiren

金虫 (正式写手)

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送你一个平安果,愿你生活平安,身体康健;送你一个好运橙,愿你诚心诚意,爱情美满;送你一把开心糖,愿你口甜心甜,万事如愿;送你一个五彩蛋,祝你家庭团圆,元旦快乐!
11楼2013-01-05 09:28:50
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zbj

至尊木虫 (正式写手)

引用回帖:
9楼: Originally posted by ll9999 at 2013-01-05 08:57:16
聚甲醛(pom)是一种性能优良的工程塑料,在国外有“夺钢”、“ 超钢”之称。
pom具有类似金属的硬度、强度和钢性,在很宽的温度和湿度范围内都具有很好的自润滑性、良好的耐疲劳性,并富于弹性,此外它还有较好的 ...

谢谢回复.
聚甲醛似乎没有延展性. 我想知道是否存在具有延展性的塑料. 众所周知, 某些塑料的硬度、强度和钢性是可以替代金属的.
12楼2013-01-05 18:56:00
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ll9999

专家顾问 (文坛精英)

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就是具有延展性才是工程塑料
13楼2013-01-05 23:16:47
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penny0532

木虫 (小有名气)

Is plastic malleable?

"Plastic" means, essentially, that something can be molded into another form.
"Malleable" strictly speaking means that something can be hammered into another form.
Plastic is also used to refer to polymeric materials. Most plastics in this sense are not at all malleable; thermoplastic materials can be heated and reshaped, but generally this is not done by hammering.
Malleability is a characteristic associated with metals.

https://wiki.answers.com/Q/Is_plastic_malleable
14楼2013-01-06 01:02:08
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