Both the R groups are alkoxy residues.两个R基团都是烷氧基.R " is a replaceable function , e . g . acetoxy, methoxy, their acyloxy and alkoxy homologs or halo.R ” 是取化基,如乙氧基 、 甲氧基及它们的环氧和烷氧同系物或卤基....
They occupied the first two floors of the tower.他们占用了塔楼的头两层。The soldiers commandeered vehicles in the capital and occupied the television station.士兵们征用首都的车辆，并且占领了电视台。The company rented the building, occupied part and sub...