单项选择题

模拟控制系统信号流图如图所示，则这个系统的相对稳态误差为（）。

A．

B．

C．

D．

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单项选择题

The functional view not only regards language as a linguistic system but also a means for doing things. In order to perform functions, learners need to know how to combine the grammatical rules and the vocabulary to express notions that perform the functions. A、正确 B、错误

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