It's still not known how many died in the volleys of gunfire.现在还不知道有多少人在枪林弹雨中身亡。Medical opinion varies on how many tablets it takes to overdose.医生对于服用多少药片算作过量意见不一。It's impossible to assess how many officers are...
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...