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【单选题】
100名2型糖尿病患者接受某种药物治疗,一个月后有85名患者血糖降至正常且无不良反应,下列正确的说法为( )A.
该药物降糖效果好
B.
该药物无降糖效果
C.
样本量小尚不能作结论
D.
时间短疗效可疑
E.
未设对照组，无法作结论
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B.
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C.
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D.
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