2~4根标准轨或厂制缩短轨地段,作为与下一根长钢轨或道岔等联结的过渡段,称为()。
A、固定区
B、伸缩区
C、缓冲区
D、爬行区
参考答案:C
Mr.Smith used to ____ his car to work,but now he is used to ________.
A.drive;walk
B.driving;walking
C.driving;walk
D.drive;walking
面侧深区的内容不包括()
A.翼丛
B.上颌动脉
C.翼外肌
D.腮腺
E.下颌神经及其分支