皮皮学，免费搜题
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【单选题】
在十二指肠溃疡病人和对照组中进行血型分布的大样本调查，血型分为0、A、B、AB 型，为比较病例组和对照组之问的血型分布的差异，需要采用A.
U检验
B.
T检验
C.
配对t检验
D.
X2检验
E.
q检验
拍照语音搜题，微信中搜索"皮皮学"使用
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