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1. quizlet.com › 705258931 › summary-electricity-andSummary-Electricity and Magnetism Flashcards | Quizlet

   quizlet.com › 705258931 › summary-electricity-and

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   18 hours ago · Physics. Summary-Electricity and Magnetism. 5.0 (1 review) What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions? A. a metal striker that pulls on the magnet. B. a diaphragm that vibrates around the magnet. C. a current that rapidly switches direction. D. a device that opens and closes a circuit.

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3. www.gkzhan.com › chanpin › 13339820Rexroth赶早报价R900537344 VT11131-12德国品牌-智能制造网

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