题目内容

高效液相色谱的三大技术难题指的是？

A. 固定相的制备
B. 小体积检测器的制备
C. 高压泵的制造
D. 液相色谱柱的制备

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以下那些物质适合液相色谱分析？

A. 氨基酸、核酸
B. 多肽、蛋白质
C. 大分子药物

John was so sleepy he could not keep his eyes ____.

A. open
B. opened
C. to open
D. opening

When he was told the truth, he got ____ with me.

A. angry
B. angrily
C. anger
D. excitedly

It’s not ____ whether he’ll return the book to me soon.

A. certain
B. certainly
C. sure
D. surely