1927年8月7日，中共中央在汉口召开紧急会议，毛泽东在会上提出（）的重要思想。这次会议史称“八七会议”。
Which of the following is true about routers internal to a totally NSSA area?（）
A. Routers cannot redistribute external routes into the area.
B. Routers should have zero Type 3 LSAs in their LSDBs.
C. Routers should have zero Type 5 LSAs in their LSDBs.
D. Routers should learn default routes from the ABRs attached to the area.
隧道内每隔（）米设有一台隧道电话，直接接通所属车站的（）。
具有收敛止血、固精止带、制酸止痛、收湿敛疮功效的药物是（）
A. 瓦楞子
B. 牡蛎
C. 乌贼骨
D. 赤石脂
E. 禹余粮
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