In 1831, Faraday discovered that electricity moves through a wire ________ a magnet(磁铁) is moved near the wire.
A.where | B.so | C.when | D.but |
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In 1831, Faraday discovered that electricity moves through a wire ________ a magnet(磁铁) is moved near the wire.
A.where | B.so | C.when | D.but |