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【单选题】
“则外寒,则内热”,此论出自于
A.
《内经》
B.
《金匮要略》
C.
《难经》
D.
《医宗必读》
E.
《诸病源》
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A.
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B.
How
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What
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A.
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B.
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C.
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A.
in front of 
B.
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A.
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B.
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C.
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D.
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