碳的诸多同位素the many isotopes of carbon碳的化合价是4价。Carbon has a valency of 4.通过环氧化和氧化就得到外消旋的含十八个碳的昆虫返动激素.Epoxidation and oxidation gave the racemic C 18 - juvenile hormone....
弗里达咧嘴笑了，捏了捏他的屁股。Frieda grinned, pinching him on the butt.我被骗在弗里达买了块沼泽地.I got snookered into buying a swamp land in Florida.弗里达·布赖特说过:“只有在歌剧中,人们才会为爱而死. ”Freda Bcenter says, Only in opera do people die of love . Itstrue....