Most of the time, the nonexpert will ____ the same answer
A. come up with
B. come up
C. come off
D. come on
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Some movie stars have ____ and think the world revolves around them. Their self-importance is often ridiculous.
A. a small ego
B. a huge ego
C. an inferior ego
D. an ego
高效液相色谱中的______ 技术类似于气相色谱中的程序升温,不过前者连续改变的是流动相的组成与极性,而后者改变的是______ 。
高效液-固色谱中,待测组分与极性吸附中心的相互作用力,会随待测组分中官能团极性的______ (增加或减小)或极性官能团数目的______ (增加或减小)而增加,使待测组分的保留时间______ (增大或减小)。
高效液相色谱分析中,为避免固定液流失现象,一般采用______ 固定相。