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【多选题】
关于 SLS 用高分子材料表述正确的有 ( ) 。A.
用于 SLS 工艺的高分子材料可分为非结晶性高分子材料和结晶性高分子材料。
B.
对于非结晶性高分子，激光扫描使其温度升高到玻璃化温度，粉末颗粒发生软化而相互黏结成形。
C.
对于结晶性高分子，激光使其温度升高到熔融温度，粉末可以完全融化而成形。
D.
聚苯乙烯属于非结晶性高分子材料。
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