鹅口疮的病因是
A.病因不清,多种因素作用 B.抗生素的大量使用,发生菌群失调,或免疫抑制剂的应用使免疫力降低 C.病毒感染 D.螺旋体感染 E.局部刺激
参考答案:B
Neil has _______ bedroom. He has many toys in it. [ ]
A. his own
B. he own
C. own his
D. her own
慢性根尖周炎的检查方法( )
A.电诊法B.X线检查C.染色法D.麻醉法E.嗅诊