Tony Green has worked very hard to make his dream a(n) _________ .
A. situation
B. reality
C. embarrass
D. interview
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We should all take a leaf ______ of Lei Feng’s book.
A. out
B. from
C. in
D. at
Tom’s dream is to become a doctor, and he is working very hard to turn his dream ____ a reality.
A. to
B. in
C. into
D. from
采用毛细管区带电泳分析某样品,阴离子和阳离子都发生迁移,中性分子也向阴极迁移,则中性分子的驱动力是()。
A. 电压
B. 电流
C. 电渗流
D. 电泳流
高效毛细管电泳相对于传统电泳方法,分离效率大大提高的主要原因是()。
A. 毛细管分离柱和高电压
B. 毛细管分离柱和高压泵
C. 空心毛细管柱和大电流
D. 高压泵和高流速