行Caldwell-Luc手术时进入窦腔的部位是（）。
A.上颌窦裂孔
B.眶下孔
C.下鼻道
D.翼腭窝
E.尖牙窝
参考答案：E
--I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20?
--Sorry, I__________myself clear. We want to return on October 20.
A．hadn't made
B．wouldn't make
C．don't make
D．haven't made
消化性溃疡在何部位易引起大出血
A．胃小弯
B．幽门
C．十二指肠下段
D．十二指肠球部后壁
