心肌缺血后，血中出现高峰浓度最晚的是()
A．CK
B．CK-MB
C．LDH
D．cTn
E．AST
参考答案：C
Look, Wang Bing is stopping David. He's ____ David. [ ]
A. in front of
B. behind
C. between
请列出OSPF建立邻居关系时的五种报文。
