山东的历代厨师利用丰富的物产，创造了较高的烹饪技术，发展完善了（）。
A、鲁菜
B、济南菜
C、青岛菜
D、烟台菜
参考答案：A
TCP functions at the Open System Interconnection (OSI) (61) layer, or Layer 4. Its chief responsibility is to ensure (62) end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each (63) sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3 (64) . This information, combined with routing tables and other network intelligence, is all it takes to get (65) the room or around the world via TCP/IP.
A．across
B．up
C．off
D．rid
循环氢中硫化氢的含量越高越好。（）
