（5分）在LC振荡电路中，L、C已知，则振荡电流的方向每秒钟改变____

（5分）在LC振荡电路中，L、C已知，则振荡电流的方向每秒钟改变________次。

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（5分）在LC振荡电路中，L、C已知，则振荡电流的方向每秒钟改变____

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