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【单选题】
反合相色谱中,将十八烷基键合在硅胶表面所得的ODS柱,主要用于分离A.
极性化合物
B.
极性非极性化合物均可
C.
非极性和中等极性化合物
D.
只能分离非极性化合物
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举一反三
【单选题】Too much to dirty air can cause people to suffer from allergies and diseases that will eventually affect people ’ s health.
A.
Deficit
B.
adjust
C.
exposure
D.
condense
【简答题】The mayor decided to ( ) his speech in order to leave enough time for his audience to raise questions. 2. It was reported that there was a vehicle missing every 20 seconds in the US. ...
【简答题】What problems do the speakers identify for each experiment? Choose your answers from the box and write the letters A-H next to questions 1-5. Problems A. too messy A. too boring B. too difficult C. to...
【单选题】Too much _____ to dirty air can cause people to suffer from allergies and diseases that will eventually affect people ’ s health.
A.
deficit
B.
efficiency
C.
proficiency
D.
exposure
【单选题】Too much ________ to dirty air can cause people to suffer from allergies and diseases that will eventually affect people's health.
A.
expansion
B.
exposure
C.
extension
D.
exploration
【简答题】I don’t really like my town. Every summer, too many tourists come here, so there are ___1_____(A. too much; B. too many; C. not enough) cars in the streets, and that means there’s ___2_______ (A. too ...
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