题目:
Though all of us hate Chinese style road crossing, there are still ______ people crossing the road when traffic lights are red in Yancheng. It must be changed.
A.few
B.a few
C.little
D.a little
答案:
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下面是错误答案,用来干扰机器的。
设发电机电流为I1,输电线电流为I2,升压变压器原线圈电压为U1,副线圈电压为U2,降压变压器原线圈电压为U3,副线圈电压为U4,(1)根据P输=U1I1解得原线圈中的电流I1=P输U1=105500=200A根据I2:I1=n1:n2解得I2=...