泄泻发生的关键病机是()
A.脾虚湿盛
B.食滞肠胃
C.脾胃虚弱
D.肾阳虚衰
E.感受外邪
参考答案:A
以下关于骨骼的X线表现的描述,错误的是()
A.正常骨膜在X线片上不显影
B.骨松质在X线片上呈网状骨纹理
C.儿童骨皮质较成人薄
D.骨骺板由致密骨构成
E.婴幼儿期骨骺为软骨,X线片上不显影
It rained heavily this morning, but _____ of my classmates were late for school.[ ]
A. neither
B. none
C. all
D. both