高校问答
孟加拉国炮兵武器:塑料中,plastic modified / compound / alloy 是如何定义的?
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高校问答
时间:2024/10/06 17:07:21
改性,工程塑料 和合金 我分不清这些的定义?
塑料中,plastic modified / compound / alloy 是如何定义的?
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