线圈产生感应电动势的大小正比于穿过线圈的()。
A.磁通量的变化量
B.磁通量的变化率
C.磁通量的大小
D.磁通量的方向
参考答案:B
I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
A.when; who
B.that; which
C.which; that
D.when; which
转胞的病因病机是胎气下坠,压迫膀胱,水道不通,尿不得出。临床分为()
A.肾虚气虚
B.脾虚肾虚
C.中气不足
D.阴虚阳虚
E.气虚血虚