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【单选题】
药物治疗指数是指
A.
LD50与ED50之比
B.
ED50与LD50之比
C.
比值越大,药物毒性越大
D.
LD50与ED50之差
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A.
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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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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.
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A.
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B.
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C.
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