— ____ hobby?
— She likes riding a bike.
一辆汽车在高速公路上以30m/s的速度匀速行驶,由于在前方出现险情,司机采取紧急刹车,刹车时加速度的大小为 5m/s2,求:
There is ruler, eraser and some pens in my pencil-box.