有一辆娱乐电瓶车,工作电压为24伏,工作电流为10安,总效率为80%,车及人总重为2000牛,行驶时阻力为车总重的0.1倍。该车匀速行驶120米需____ 秒。若不考虑电动车传动过程中的能量损失,则该电动车的电动机的电阻为____ 欧姆。
— Mum, I don't quite understand the Chinese saying.
— Dear, don't worry. _______ the years go by, you will get to know it.
不等式组x+1<32x-1>x 的解集是( )