There a river in the nature park. [ ]
A. am
B. is
C. are
答案：B
适用于吻合直径1mm以下血管和淋巴结的缝线是（）
A.7-0
B.8-0
C.9-0
D.10-0
E.11-0
变压器自动跳闸怎样处理？
