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make friends friendship help out lend borrowshare lonely chat competition play cards6. He doesn’t feel ________ when he is left alone.

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make friends friendship help out lend borrowshare lonely chat competition play cards7. They held out the hand of ________ to me.

make friends friendship help out lend borrowshare lonely chat competition play cards8. There is keen ________ between the two motorcar firms.

[WJ-500-100]在OSI参考模型中提供端到端的可靠性服务是在哪一层上完成的？

A. 数据链路层
B. 网络层
C. 传输层
D. 会话层

[WJ-500-100]在OSI参考模型中提供端到端的可靠性服务是在（）上完成的

A. 数据链路层
B. 网络层
C. 传输层
D. 会话层