题目内容

What is Bradley's attitude towards teaching?

A. He will insist and overcome all the obstacles.
B. He will change a job if teaching is too hard.

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What does Norman advise Bradley to do?

A. To improve teaching skills for better teaching.
B. To try other jobs insead of just teaching.

外力作用于杆端的方式不同,只会使与杆端距离不大于横向尺寸的范围内受到影响

A. 对
B. 错

比较相对分子质量相近的醇、醚、醛酮、烷烃的沸点( )

A. 醇>醚>醛酮>烷烃
B. 醇>醛酮>醚>烷烃
C. 醇>醛酮>烷烃>醚
D. 醇>醚>烷烃>醛酮

醛酮的结构中,C=O极性较(大/小),电子云靠近的一端,氧带部分(正/负)电荷,碳带部分(正/负)电荷,因此,醛、酮是分子(极性/非极性)。

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