发布时间:2025-02-05 14:09:11
所有的高分子材料都对应了其本身的熔点或玻璃化转化温度(Tg)。一些semi-crytalline的高分子同时拥有熔点和Tg。所以所有的高分子化合物都是相变材料。常见的是聚乙烯PE,聚丙烯PP,聚氯乙烯PVC,PET,PEO,PVP等,其中有水溶性的,有非水溶性的。大部分高分子材料的应用是先使其融化或变软,在定型。所以使用温度一般要高于高分子本身的Tg或熔点
我的书桌装修的时候已经是跟墙壁连在一起的不能移动但是我现在想搬走它怎么办阿
2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11罗汉松黄杨黑松五针松以大树为主盆景为辅哪一个比较值钱可以从贵到低可以从2050考虑谢谢
2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11 2025-02-05 14:09:11