吻合血管前应去除吻合口周围的血管外膜约O.5cm以上，以防止血管外膜落入管腔，形成血栓。()
参考答案：错
-- What did he say ________ his stupid behavior?
-- He admitted having made a serious mistake.
A．in front of
B．in explanation of
C．in case of
D．in fear of
旅行社的设立审批，应根据是否______、是否______、是否具备《旅行社管理条例》规定的旅行社的设立条件等原则进行。
