[单选]
Most Computer operating systems in use today, including all consumer-targeted systems, include a TCP/IP（）.

A . plan
B . requirement
C . implementation
D . design

实体完整性规则是对（）的约束，参照完整性规则是对（）的约束。关系中不允许有重复元组的原因是（）关系中没有行序的原因是（） Very long, complex expressions in program are difficult to write correctly and difficult to（）. defend。 detect。 default。 debug。对我国计算机软件著作权的保护范围，下列（）不属于保护范围。计算机程序及其有关文档。计算机软件开发所用的思想。计算机软件开发所用的处理过程、操作方法。计算机软件开发所用的数学概念。

Most Computer operating systems in use today, including all consumer-targeted systems, include a TCP/IP（）.

参考答案：

● 参考解析

在当今使用的大部分操作系统中，包括所有的用户系统，都含有TCP/IP实现。

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[单选] Most Computer operating systems in use today, including all consumer-targeted systems, include a TCP/IP（）.

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[单选]
Most Computer operating systems in use today, including all consumer-targeted systems, include a TCP/IP（）.