题干
Success in life doesn’t
happen . It’s the result of devoting your time and energy to what you’ve set out to do.
happen . It’s the result of devoting your time and energy to what you’ve set out to do.
A：in case
B：by chance
C：in retur
D：by nature
答案(点此获取答案解析）
B
的圆心角所对的弧长为( )