题干
---You didn’t come to the party yesterday.
---- ______? I’m not a party animal.
---- ______? I’m not a party animal.
A：How can I have
B：How would I have
C：Why should I have
D：Why must I have
答案(点此获取答案解析）
C
T时，原线圈的电流i＝30 mA，由此可知，此变压器的原副线圈匝数之比为( )