聚硅烷橡胶因性能随温度变化小,故在高温和低温的场合都能用.Silicone rubbers are used for both high - and low - temperature appilcations, since their properties change little with temperature.置于清洁 、 干燥及低温的环境中.Keep in a clean, dry and low temperature s...
They campaign nationally for the protection of commons, village greens and footpaths.他们在全国搞运动宣传保护城市公园 、 乡村绿地和人行小径.I do hope that people will make use of footpaths and treat them with due attention that is needed.我真希望人们使用...