Using benzene as internal standard, the calibration factors of derivative of aldehydes 2,4 - dinitrophenylhydrazine ( DNPH ) were measured.将醛类物质与2, 4- 二硝基苯肼 ( DNPH ) 的衍生反应液直接进样,以苯为内标物,测定了甲醛 、 乙醛等醛类物质DNPH衍生物的校正因子....
He persevered despite discouragement from those around him.尽管周围一片劝阻声，他还是锲而不舍。Attendance figures had been steadily dropping, creating a mood of doom and discouragement among theatre directors.上座人数一直持续下降，使得戏剧导演产生悲观泄气的情绪。Fa...
For example, they complain that many school - leavers cannot speak clearly.比如, 他们抱怨很多离校生说话不清楚.Many entry-level jobs were filled by school leavers.很多初级水平工作都由中学毕业生来做。the problem of rising unemployment among school-leavers毕...
The television was sheathed in a snug coverlet.电视机用一个床罩严严实实地盖住了。The curtains and the coverlet of the bed were chocolate velvet...窗帘和床罩是深棕色天鹅绒的。The curtains and the coverlet of the bed were chocolate velvet.窗帘和床罩是深棕色天鹅绒的。...
这实际上已是该学说的终结，只是未被道明罢了。It's the end of the doctrine in all but name.这一研究方法与对城市发展学说的许多研究工作相吻合.This approach corresponds to much of the work done on urban - growth theory.列宁顽强地为维护马克思主义学说的纯洁性而战斗.Lenin fought stubbornly ...