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【多选题】
可以改变荧光分析法的灵敏度的措施是（）。A.
增强激发光源强度
B.
降低溶剂极性
C.
增加检测器的灵敏度
D.
升高测量温度
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皮皮学刷刷变学霸
举一反三
【单选题】Why were early umbrellas difficult to use?
A.
Because they were very big.
B.
Because they were very small.
C.
Because they were made of wood.
【单选题】--The fish were ______yesterday, but they are all died today, why? --Maybe they were lack of oxygen.
A.
life
B.
love
C.
alive
D.
lovely