We have many ______. [ ]
A. sport club
B. sports clubs
C. sports club
D. sport clubs
B
以下不属于癌前状态的是()
A.口腔白斑
B.口腔红斑
C.复发性阿弗他溃疡
D.口腔扁平苔藓
E.口腔黏膜下纤维化
急性出血坏死性小肠炎常合并病原菌感染,下列哪种病原菌与本病无关
A.沙门菌B.克雷伯菌C.溶血链球菌D.厌氧菌E.以上都无关