口腔前庭内,位于中线上的解剖标志为()
A.切牙乳突
B.舌系带
C.上颊系带
D.下颊系带
E.唇系带
参考答案:E
That was the first time I _____ there and I was impressed by the friendly people very much. [ ]
A. go
B. was going
C. had gone
D. have gone
各级公安消防部队必须建立严格的战备值班制度,保证不间断值班。()