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A. sad
B. solemn
C. happy
D. funeral

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W: I‘ m terribly sorry I‘ m late. I had rather a difficult time finding your office.
M:__________

A. Saying sorry won" t be enough for being late. You have to account for what you" ve done.
B. That" s all right. Please sit down and I" 11 start to ask you a few questions.
C. You needn" t saying sorry. It" s often the case.
D. Put on your name in the attendance record and go to your work.

通过增大入射光的波长,可提高分子吸光光度分析法的灵敏度。

AAS分析中,消除电离干扰的方法就是在试液中加入适量难以电离的其他元素。

色谱分析时,事先将样品进行预分离可以提高柱效能。

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