活鲟鱼苗
参考答案:25(0301.9912)
Do you like soccer with me after school?[ ]
A. playing
B. playing the
C. to play
D. play
A.变压器输出功率为200W
B.若n1=100匝,则输出端线圈的磁通量变化率的最大值为2Wb/s
C.副线圈两端的电压表示数20V
D.变压器的输入功率是由发电厂的输出功率决定的