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【单选题】
在气相色谱中，只要柱温、固定相性质不变，即使柱径、柱长、填充情况及流动相流速有所变化，（）仍保持不变。A.
保留时间
B.
调整保留时间
C.
保留体积
D.
相对保留值
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反馈参考答案：
举一反三
【单选题】–Are you _______ with your present job?- Yes, that’s why I want to quit(辞职).
A.
Boring
B.
Bored
C.
Interesting
D.
Interested
【单选题】—Are you ______with your present job? —Yes, That’s why I want to quit( 辞职 ).
A.
boring
B.
bored
C.
interesting
D.
interested
【简答题】– Are you ____ with your present job? – Yes. That’s why I want to quit(辞职).A. boring B. bored C. interesting D. interested
【单选题】----Are you ____ with your present job? --- Yes. That’s why I want to quit.
A.
boring
B.
bored
C.
interesting
D.
interested
【单选题】---There’ re four bedrooms in the house_______with its own shower. -That’s what I want. I’ve got a few kids.
A.
either
B.
neither
C.
each
D.
none
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