25%=0.25=14=28=416=1：4=5：20．
故答案为：8，4，5，0.25．
—I want to go out for a dinner. Is there a _________ near here?
—Yes, there is one across from the post office.
A．bookstore
B．supermarket
C．museum
D．restaurant
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
Wb/s
V