OMG，这样也可以。。。。。

Dear Students, Due to technical problems OPNET is not working properly today. Therefore we change the working of the OPNET challenge lab. Everybody has a custom assignment that he must simulate. The students scheduled for the 5th and the 7th October can pick up their assignment tomorrow between 17:00 and 18:40 in room H320. You must answer the two question on the back of the assignment and write the answer on the very same paper. That paper will be collected by the lab supervisor on a date specified later on. We apologize for the inconvenience.