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【单选题】
如图为一继电器电路模型。继电器参数：R=100W，L=4H，当线圈电流达到6mA时，继电器动作，将触头接通。从开关闭合到触头接通时间称为时间。为改变时间，在电路中串联一个电位器，阻值从零到900W间变化。若【图片】，试求电位器电阻值变化所引起的时间的变化范围。【图片】A.
2.05ms----2.77ms
B.
20.5ms----27.7ms
C.
205ms----277ms
D.
2050ms----2770ms
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【简答题】N型半导体是在半导体中掺杂了 价的 元素,其多子是
【单选题】Which of the following can be inferred from the passage?______
A.
To Hindus, marriage is important but not necessary
B.
Although family is important, no one expects young Indians to give up their own happiness for the benefit of the family
C.
Young Indians do not traditionally go on dates with their future spouses
D.
Although many marriages are still arranged, most young people nowadays choose their marriage partner on the basis of love
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