What method in a Cisco IOS router can confirm that packets marked for a particular QoS marking are being matched?（） ["Issue a show policy-map interface command. ","Assuming Netflow is enabled, issue a show ip cache verbose flow command.","Issue a show crypto ipsec session command.","Issue a debug qos set command and a terminal monitor command."]
由酪氨酸合成去甲肾上腺素的限速酶是（） ["多巴脱羟酶","单胺氧化酶","酪氨酸羟化酶","儿茶酚氧位甲基转移酶","多巴胺羟化酶"]
Which one of the following statements about the TNSPING utility is correct？（） ["It helps you to determine whether or not the Oracle database is running.","It requires the username and password to check the connectivity of the service.","It does not require the username and password to check the connectivity of the service.","It establishes a session with the database and checks the connectivity of the service."]
If node 2 is accepting line timing from node 1， node 2 will send （） to node 1 as its SSM messge. [" AMI"," DUS"," ESF"," PRS"," SMC"," B8ZS"]
母线差动保护在外部故障时，其差动回路电流等于（）（不考虑电流互感器的误差），在内部故障时，其差动回路的电流等于（）。
（）是“启蒙文学”的先驱，鲁迅、郭沫若、茅盾等作家可以看作其主要代表。
