一级特级毛片免费不卡直接观看,欧美色婷婷天堂网站,亚洲男女H,日韩综合区,国产在线观看av直播,久色频网站在线一道本亚洲,美女自慰夜间福利

您的瀏覽器版本太低,將不能正常瀏覽。請(qǐng)升級(jí) Internet Explorer或使用Google Chrome瀏覽器。
如果您在使用雙核瀏覽器,請(qǐng)切換到高速 / 極速 / 神速 核心。
Crude Benzene
Product
2020-03-26
Crude Benzene
The quality of crude benzene meets the requirements of national standards and the production license for hazardous chemicals has been obtained.
Quality standards are shown below:
Appearance   Yellow transparent liquid
Density   0.871-0.900
Prior to 75℃(%)  
Prior to 180℃ (%)      93
96% (soluble)is distilled at  
Moisture   No visible insoluble in water by visual inspection at room temperature (18-25℃)