Answer:
the practice of exchanging things with others for mutual benefit, especially privileges granted by one country or organization to another.
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Answer:
In linear systems is the principle that a response Rab, measured at a location (and direction if applicable). A, when the system has an excitation signal applied at a location (and direction if applicable), B, is exactly equal to Rba which is the response at location b, when that same excitation is applied at a. This applies for all frequencies of the excitation signal.
Explanation:
