蚯蚓可以式土壤疏松,增加土壤肥力,这说明了( )
— Yes. It is beautiful and has many colours.
某飞机在5s内匀速飞行了1000m,它飞行的速度为 ____ m/s,合 ____ km/h.
计算: (−12)−2 + 3 tan60°+|-1|+(2cos60°+1)0.