龈下菌斑通常为()
A.光滑面菌斑与邻面菌斑
B.附着菌斑与非附着菌斑
C.舌侧菌斑与颊侧菌斑
D.光滑面菌斑与点隙裂沟菌斑
E.点隙裂沟菌斑与根面菌斑
参考答案:B
Mr Wang does what he can ________ us improve our English. [ ]
A. help
B. to help
C. helping
D. helped
下列“影像征象-相应诊断”关系,错误的是()
A.弹簧征,肠套叠卷
B.线征,小肠蛔虫症
C.雾滴征,胃癌
D.跳跃征,溃疡性肠结核
E.狗耳征,阑尾炎