They were principally used to catalyze aldol, allylation, Diels - Alder, ene and Friedel - Crafts reactions.它们主要被用来催化Aldol, 烯丙基化, Diels-Alder, Ene和 Friedel -Crafts等反应.They are highly specific for the reactions that they ...
She described the degradations she had been forced to suffer.她描述了自己被迫经受的屈辱。The researches of the thermal and photo degradations of aramid fibers are systematically discussed.摘要阐述了芳纶的热、光老化降解研究的进展情况.The microbial and oxida...
The boat was anchored off the northern coast of the peninsula.这艘船停泊在离该半岛北部海岸不远的地方。All the attractions of the peninsula beckon.半岛上的各处景点无不令人心驰神往。Dalian is in the south of the Liaodong Peninsula.大连位于辽东半岛南部....
Closures and job losses are again being announced with monotonous regularity.倒闭和失业的消息又在一次次地反复宣布着。They are arguing against hospital closures.他们据理反对关闭医院。Other areas are to lose aid so that money can be reallocated to towns...