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连续时间系统中,当信号无失真传输时,系统的冲激响应是冲激函数。

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13. Western culture is a harmonious culture, which emphasizes the symmetry and unified costume modeling method.

语言是文化的载体,具有一定的独立性和持久性。()

6. The first one is Opera _______________which means most of them are based on the myth or historical stories.

备课是教学准备的过程,而教案仅是这一过程的书面记录,是备课这项活动的第一个环节。()

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