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 ...
The European anthem was played at the opening and closing ceremonies.欧洲颂歌在开幕式和闭幕式上演奏。The anthem that the organist played cemented Soapy to the iron fence.风琴师弹奏的赞美诗音乐把苏贝胶在铁栏杆上了.There is no flag raising or national anthem ...
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....
Aphid count on plants in fields do not correlate with virus spread in the same fields.田间植株蚜数与同块田内病毒的扩散程度间无相关性.Since aphid population may become resistant to organophosphorus compounds, avoid excessive spraying.因为蚜虫类对有机磷化...
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...