发布时间:2025-02-03 14:14:38
耐寒增塑剂,另外还可以加粉末丁腈橡胶粉之类。冬天夏天配方。
密封条基本黑色,里面炭黑就有耐老化作用。
我十四岁男孩因为晚上睡觉怕黑所以在卧室最黑的位置放了一盏灯光微亮的小夜灯这样有没有什么危害
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