根据无牙颌的组织结构和全口义齿的关系,将无牙颌分成()
A.3个区
B.4个区
C.5个区
D.6个区
E.8个区
参考答案:B
DB11/418是《电梯日常维护保养规则》中是什么内容?
—Do you speak English?
—Yes, I speak ______ a little English ______ some French.
A.neither, not
B.both, or
C.either, or
D.not only, but also