Polystyrene - supported N - benzyl - N - alkyl - aminopyridine was prepared through chloromethylated polystyrene treated with 4 - aminopyridine and alkylation agents.本文以聚苯乙烯氯球为原料,通过与 4- 氨基吡啶及烷基化试剂反应,制成聚苯乙烯支载N - 烷基-N-苄基氨基...
This may necessitate transmitting and receiving signals in different frequency bands.这可能使在不同频段内发射及接收信号成为必要的.Transmitting nerve impulses away from the central nervous system ; efferent.与向运动受 动器 传送的神经元或神经冲动相关.FDD reduces i...
Most large businesses were collectivized at the start of the war.大部分大型企业在战争初期都转为了公有。Agricultural internationalization and global agricultural integration management is the world economy globalization and collectivized co...
Saunas can be hazardous if misused. Avoid a big meal beforehand.洗桑拿浴如果方法不当会有危险,浴前切忌饱食。He misused his dog shamefully.他可耻地虐待自己的狗.He had grossly misused his power.他严重滥用职权....