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【单选题】
问卷法的优点是( )A.
灵活性大
B.
指导性高
C.
问卷内容客观统一，处理分析方便
D.
控制性强
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
轻症中暑、重症中暑
E.
以上都不是
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