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【简答题】
电流对人体的伤害可分为两种类型()和电击。
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【简答题】目标成本管理是以（）为依据。
【单选题】当线圈加有效值为 100V 的交流电压时,电流有效值为 2A ,有功功率为 120W ,则线圈的电路模型为( )。
A.
30 W 电阻与 40 W 感抗串联
B.
40 W 电阻与 30 W 感抗串联
C.
0.012 W 电阻和 0.016 W 感抗串联
【简答题】一线圈加30V直流电压时，消耗功率P1=100W，当加有效值为220V的交流电压时，消耗功率P 2 =3059W，求该线圈的电抗多少Ω。
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