【单选题】按S N 1历程, 不是 化合物 CH 3 CH 2 CH 2 Br 、 (CH 3 ) 2 CHBr 、 (CH 3 ) 3 CBr 反应活性依次增强的原因是:
A.
生成的碳正离子中 参与 σ -p 超共轭效应的 C-H 单键依次增加
【简答题】The novel written by Nathaniel Hawthorne that bears a direct allusion to the notorious Salem witchcraft trials is ________________.
【单选题】不同厚度板材采用不同直径的电极进行点焊时,下列说法中正确的是( )
【单选题】在工作场合,握手时符合礼仪规范的是( )。
D.
客人抵达时,通常应该由主人首先伸出手与客人相握。
【单选题】牙菌斑葡萄糖分解代谢的EMP途径的终产物是
【简答题】Nathaniel Hawthorne gave a definition to the term 'romance' in his Preface to the novel ---. A.The House of the Seven Gables B.The Scarlet Letter C.The Marble Faun
【单选题】Nathaniel Hawthorne considered himself a psychological novelist. Guilt, isolation, repentance, despair and redemption are the major themes which are reflected in his masterpiece_________.
【单选题】妊娠期贫血下列哪项不正确:
C.
产妇度重度贫血的耐受性好,不易发生失血性休克
【简答题】As a novelist, Nathaniel Hawthorne was deeply influenced by Puritanism.
【单选题】王女士,孕 15 周,自觉乏力、食欲不振,诊断为妊娠期贫血,下列哪项不正确
C.
产妇对重度贫血的耐受性好,不易发生失血性休克