Optionally, the purified diisobutylene may be hydrogenated to isooctane hydrogenation catalyst.任选的是, 可用加氢催化剂将纯化的二聚异丁烯加氢生成异辛烷.It is infrequence in China that the weld high - temperature high - pressure hydrogenation pipe ...
They knock around on weekends in grubby sweaters and pants.他们周末穿着邋遢的毛衫和裤子到处闲逛。His white coat was grubby and stained.他的白色外套污迹斑斑，简直脏透了。Look at your grubby hands!看你那双脏手!...
You can buy refrigerators, stoves, dishwashers, and other appliances there.在那里可以买到冰箱 、 炉具 、 洗碗机和其他家电产品.Some of the most efficient refrigerators consume 70 percent less electricity than traditional models.一些极为节能的冰箱比传统型号耗电...