Which of the following are devices that utilize electromagnets? Select all that apply? relay switches doorbells crane pull

Question

Which of the following are devices that utilize electromagnets? Select all that apply?
relay switches
doorbells
crane pulleys
security locks

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Thành Công 5 months 2021-08-28T10:39:56+00:00 1 Answers 4 views 0

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    2021-08-28T10:41:22+00:00

    Doorbells and security locks!

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )