皮皮学，免费搜题
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搜题
【单选题】
选择萃取的试剂时,萃取剂与原溶剂( )。
A.
以任意比混溶
B.
必须互不相溶
C.
能发生有效的络合反应
D.
不能反应
拍照语音搜题，微信中搜索"皮皮学"使用
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