试题与答案

如图(a)所示的LC振荡电路中,通过P点的电流随时间变化的图线如图(b)所示,若

题型:选择题

题目:

如图(a)所示的LC振荡电路中,通过P点的电流随时间变化的图线如图(b)所示,若把通过P点向右的电流规定为i轴的正方向,则

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A.0至0.5ms内,电容器C正在充电

B.0.5ms至1ms内,电容器上极板带正电荷

C.1ms至1.5ms内,Q点比P点电势高 

D.1.5ms至2ms内电场能在减少

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D解析:本题考核影响直接人工成本差异的因素。直接人工成本差异=(实际工时一计划工时)×计划每小时工资成本+实际工时×(实际每小时工资成本一计划每小时工资成本)。

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