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【简答题】
电磁力的大小与导体所处的磁感应强度，导体在磁场中的长度和通过导体中的电流的乘积成正比。（）
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【单选题】______ he realized it was too late to return home.
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【单选题】在Java中,当在类中定义两个或多个方法,他们有相同的名称而参数项不同时,这称为( )
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