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【多选题】
以下对色谱分析法描述正确的是A.
色谱分析法是一种物理或物理化学的分离分析方法
B.
色谱法通常一特定的色谱系统（如 TLC ， HPLC 或 GC 系统等）进行分离分析
C.
分配系数的不同使不同组分在色谱中得到分离
D.
色谱分析法的定性能力高于化学法和光谱法
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皮皮学刷刷变学霸
举一反三
【简答题】A．By reducing the blood pressure. B．By the brain active. C．By reducing tension caused by work. D．By improving the awareness.
【简答题】A．Providing information people need. B．Reducing the price of the product. C．Reducing production cost by expanding production scale. D．Supporting noncommercial programs with the money they bring in.
【单选题】As far as stress-reducing mechanism is concerned ______.
A.
stress-reducing professionals can provide all satisfactory stress-reducing services
B.
people don't want to tell others about their problems except their partners
C.
people don't tell their husbands or wives their problems except stress-reducing professionals
D.
the husband or wife can provide many kinds of stress-reducing behaviors
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