你可能感興趣的試題

單項選擇題

If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be （）

A.quartered
B.unchanged
C.doubled
D.quadrupled

單項選擇題

AC and DC generators are similar in that they （）

A.both generate alternating voltages
B.both rectify the voltage before delivery
C.are constructed at the same physical size for the same kilowatt rating
D.both supply three-phase power

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