颅中窝与颞下窝相通可通过（）
A.眶上裂
B.棘孔
C.眶下裂
D.圆孔
E.破裂孔
参考答案：B
Li Ming’s best friend Wang Dong ___ behind me in our classroom. [ ]
A. were sitting
B. sits
C. are sitting
D. sit
基站的接地电阻要求不大于5Ω。
