题型:填空题 一辆汽车从静止开始沿直线匀加速开出,然后保持匀速运动,最后匀减速运动,直到停止,下表给出了不同时刻汽车的速度,则汽车从开出到开始做匀速运动经历的时间是 s。总共通过的路程是 m。时刻(s)2.04.06.010.014.019.021.0速度(m/s)369121293 查看答案
题型:填空题 As the propeller turns,voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency,pitting of the blades,and vibration. These voids are known as().A.advanceB.cavitationC.edgingD.slip 查看答案