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【单选题】
用于衡量色谱柱的分离效能高低的参数为（）A.
t R
B.
R
C.
H
D.
n
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【单选题】—Call me at 9: 00.I can't afford to miss such a conference. —Don't worry, sir. You'll surely be __________. [ ]
A.
reminded
B.
warned
C.
informed
D.
remembered
【简答题】不同的语气表达的感彩各不相同，请将下面在故事讲述者常见感情与其合适的语气表达方式进行匹配。A. 喜悦、欢快B. 憎恨、厌恶C. 悲伤、难过D. 害怕、恐惧E. 怀疑、犹豫
【单选题】—Tony, make sure everything _____ for the meeting before 7:30. —Don't worry about it, sir. I've already made it. [ ]
A.
is prepared
B.
is being prepared
C.
has prepared
D.
will be preparing
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