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.The results show that zinc acetate - stearic acyloxy has thermal stability and synerg...
It is nearly always women who are the primary care givers.从事初级保健护理工作的几乎都是女性。She denied the murder of four children who were in her care.她否认杀害了她所照管的4个孩子。Condoms are an effective method of birth control if used with care.如...