题型:问答题 简答题 It is a mainly dry country with only a few coastal areas that have ____ rainfall to support a large population.A.desperateB.stubbornC.violentD.adequate 查看答案
题型:问答题 简答题 一辆重5 t的汽车,发动机的额定功率为80 kW.汽车从静止开始以加速度a=1 m/s2做匀加速直线运动,车受的阻力为车重的0.06倍,g取10 m/s2,求:(1)汽车做匀加速直线运动的最长时间tm;(2)汽车开始运动后5 s末和15 s末的瞬时功率. 查看答案