甲烷和丙烷是烷烃。Methane and propane are alkanes.丙烷气钢瓶a propane gas cylinder亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process....
GLOBE AIRLINES FLIGHT 621 TO ISTANBUL IS DEPARTING.环球航空公司飞往伊斯坦布尔的第621次客机就要出发了.The lower court in Istanbul had to go along with the decision.在伊斯坦布尔的低级法院不得不执行这个决定.Just after Pirim participated in the European Championship ...