闭合电路中产生的感应电动势的大小,取决于穿过该回路的[ ]
A.磁通量
B.磁通量的变化量
C.磁通量的变化率
D.磁场的强弱
答案:C
写出一个比零小的有理数( )。
Tomorrow is Lucy's birthday. I_______ a present_______ her.
A.want to give; for
B.wants to give; to
C.wants give; for
D.want to give; to