题干
—My girl basketball.
—Great. You must be her.
A：is good for; proud of
B：is good at; proud of
C：is good for; afraid of
D：is good at; afraid of
答案(点此获取答案解析）
B
匀速转动。从图示位置开始计时，经过时间t时感应电动势为（ ）
