皮皮学，免费搜题
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搜题
【单选题】
提取黄酮、蒽醌、有机酸等酸性成分,可采用A.
水/醇法
B.
升华法
C.
醇/水法
D.
碱提酸沉法
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】-- ________ do you hear from Karen this year? --Hardly ever.
A.
How long
B.
How often
C.
How many
D.
How much
【单选题】—_______ has your brother been a member of Trailwalker? —Ever since 2005. [ ]
A.
How far
B.
How often
C.
How long
D.
How soon
【单选题】---- _________ do you go to the cinema? ---- Hardly ever. I always see movies on TV.
A.
How long
B.
How often
C.
How soon
D.
How many times
【单选题】– do you go to the movies? – Hardly ever. I always see the films on the Internet.
A.
How long
B.
How often
C.
How much
【单选题】—_____ have you ever been to Hongkong? —Only once. [ ]
A.
How long
B.
How often
C.
How soon
D.
How many times
【多选题】斑点金免疫渗滤试验试剂盒的组成成分有
A.
渗滤装置（含塑料小盒、吸水垫料和点加了抗原或抗体的硝酸纤维素膜片）
B.
胶体金标记物
C.
洗涤液
D.
胶体金层析条
E.
底物3，3-二氨基联苯胺溶液
【单选题】— do you go to the movies? —Hardly ever.
A.
How long
B.
How often
C.
How many times
D.
How soon
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