发布时间:2025-01-25 07:36:07
1、塑料的原材料是一种聚合物,也叫树脂属于一种高分子化合物,通过加聚或缩聚反应聚合而成,主要由合成树脂及填料、增塑剂、润滑剂、色料等添加剂组成,具有绝缘性好、导热性低等优点。
2、塑料比重在0.9-2.3左右,和金属材料比,其重量只占同体积铝的1/2,钢1/5,铅的1/8。如果是多孔泡沫塑料,比重比普通塑料更轻得多。
监理工程师考试常用表格——材料(构配件)、设备进场使用报验单
2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07婴儿玩具推荐living stones47活石儿童大画板套装
2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07 2025-01-25 07:36:07