下列哪项为经导管栓塞术（）
A.脑栓塞
B.肝癌碘油栓塞术
C.肺栓塞
D.肾自截
E.肾动脉成形术
参考答案：B
The most polluting vehicles from driving through the city since then.[ ]
A. are banned
B. ban
C. have been banned
D. have banned
简述密度对直径生长的作用
