A：甲、乙两物体的角速度之比是2∶15
B：甲、乙两物体的角速度之比是15∶2
C：甲、乙两物体的周期之比是2∶15
D：甲、乙两物体的周期之比是10∶3
“一腔热血育桃李，三尺讲坛写春秋。”这句诗的寓意是( )
– How do you learn to live an easy and happy life ?– regarding problems as challenges.
— Thanks. I had to try on almost a dozen pairs _________ I decided to get them.
