问答题

TCP协议中，采用（）来区分不同的应用进程

答案： (1)
插口

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单项选择题

Jack has a backward-bending labor supply curve. At wages of 5 an hour for the first 50 hours per week and $7 an hour for every hour beyond 50 hours per week. Because of his backward bending supply curve, Jack might actually choose to work fewer hours. A. 对 B. 错

中国土壤分类系统总共拟定了20个诊断层和23个诊断特性
A、正确
B、错误

答案：正确