At first glance, the foil packet of Yunnan Baiyao capsules may seem puzzling because an unidentified little red pill lies at one end. Folklore has it that the North Vietnamese soldiers would take this red “hit pill” when seriously wounded, as in receiving a gunshot wound, and this would...
在一定的PVC泡沫塑料配方体系下,研究了阻燃材料纳米Mg(OH)2对PVC泡沫材料的主要力学性能的影响.结果表明,在25℃,纳米Mg(OH)2添加量在1.5 %以下,对拉伸强度,断裂伸长率两项指标基本没有影响;在105℃,纳米Mg(OH)2添加量在2.0 %以下,对热负荷下伸长率,冷却后永久伸长率两项指标基本没有影响.余建川...