The heptane compound has a primary purpose as a plasticizer for doublebase propellant systems.化合物庚烷的主要用途是作为双基推进剂的增塑剂.The factory produces propellant for ballistic missiles.这个工厂为弹道导弹生产推进剂。A variety of mechanical surfaces ...
She put her nose luxuriously buried in heliotrope and tea roses.她把自己的鼻子惬意地埋在天芥菜和庚申蔷薇花簇中。So Laurie played and Jo listened, with her nose luxuriously buried in heliotrope and tea roses.这样劳瑞便弹了起来.裘把自己的鼻子惬意地埋在无芥菜和庚申蔷薇花簇中倾听着....