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【单选题】
在气液色谱中,色谱柱的使用上限温度取决于A.
样品中沸点最高组分的沸点
B.
样品中各沸点的平均值
C.
固定液的最高使用温度
D.
固定液的沸点
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举一反三
【单选题】听力原文：W: Have we agreed where we're going to meet John on Sunday? M: Well, I talked to the others and nobody .seemed to have any idea where they wanted to go. W: I thought we were going to that restaur...
A.
Change a decision.
B.
Make a phone call.
C.
Suggest a place to meet.
【单选题】听力原文：W: Have we agreed where we're going to meet John on Sunday? M: Well, I talked to the others and nobody seemed to have any idea where they wanted to go. W: I thought we were going to that restaura...
A.
Change a decision.
B.
Make a phone call.
C.
Suggest a place to meet.
【简答题】红柱石、蓝晶石和夕线石三者之间为
【单选题】听力原文：W: Have we agreed where we're going to meet John on Sunday? M: Well, I talked to the others and nobody seemed to have any idea where they wanted to go. W: I thought we were going to that restaura...
A.
Change a decision.
B.
Make a phone call.
C.
Suggest a place to
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