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【单选题】
保留值定性法不包括下列哪项操作( )A.
分别以试样和标准物进样分析各自的色谱图，比较分析保留值是否相同。
B.
通过在样品中加入标准物，看试样中哪个峰增加来确定。
C.
通过改变流速和柱温加以判断。
D.
采用极性差别较大的双柱定性，进一步确认。
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举一反三
【单选题】A.He frequently gets things mixed up.B.He is always finding fault with Marsha.#
A.
He frequently gets things mixed up.
B.
He is always finding fault with Marsha.
C.
He Ires been trying hard to cover for Marsha.
D.
He often fails to follow through on his projects.
【单选题】He ________ fault with me. How can we get on well with each other?
A.
always finds
B.
is always finding
C.
has always found
D.
will always find
【单选题】— The driver was not ____ for the traffic accident, was he'? — _____. It was the pedestrian's fault. [ ]
A.
blamed; Yes
B.
to blame; No
C.
blame; Yes
D.
blaming ;No
【简答题】A．He enjoys finding fault with exams. B．He is sure of his success in the exam. C．He doesn't know if he can do well in the exam. D．He used to get straight A's in the exams he took.
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