支配肝脏的交感神经,其节前纤维来源于()
A.胸7-8
B.胸7-10
C.胸6-8
D.胸8-10
E.胸6-9
参考答案:B
I wish that you ________ such a bad headache because I’m sure that you would have enjoyed the concert.
A.hadn’t
B.didn’t have had
C.hadn’t had
D.hadn’t have
网络图的关键路线就是路长最长的线路。