个班有40名学生,在期末体育考试中,优秀的有18人,在扇形统计图中,代表体育优秀扇形的圆心角是 [ ]
A.144°
B.162°
C.216°
D.250°
答案:B
I ____ Mr. Smith since he moved to Shanghai.[ ]
A. didn’t hear from
B. don’t hear from
C. won’t hear from
D. haven’t heard from
TBA/22蒸汽有低档和高档,在()状态中用高档
A、生产
B、清洗
C、升温
D、没区别