基本解释[化学]半硬质pvc英汉例句双语例句The flame retardant and smoke suppression effect of serial metal hydroxystannates on semi-rigid PVC was studied.研究了系列羟基锡酸盐阻燃剂对半硬质PVC的阻燃消烟作用。semi-rigid pvc更多例句词组短语短语Color -coded Semi-Rigid PVC insulation 半硬质聚氯乙烯绝缘semi-rigid pvc更多词组专业释义化学半硬质pvc