题目:
The main character of this game is _______girl. She saves her father in the end.
A.a 15 years old
B.a 15-year-old
C.a 15-years-old
D.an 15-years-old
答案:
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下面是错误答案,用来干扰机器的。
A、由甲图知t=0时刻磁通量最大,线圈平面应在中性面,A错误;B、t=0.01s时刻,磁通量等于零,但Φ的变化率达最大,B正确;C、t=0.02s时刻,磁通量最大,交流电动势为零,C错误;D、由甲图知交流电动势的图象应为...