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当前学科：常用中药的鉴别
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某饮片呈类椭圆形的厚片。外表皮灰棕色，切面皮部红棕色，有数处向内嵌入木部，木部黄白色，射线呈放射状排列。原药材来源于（）
A . 木通科
B . 豆科
C . 瑞香科
D . 五加科
E . 茜草科
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