一支长为130米的队伍做匀速直线运动,速度为5米/秒,方向与列车同向.列车长150米,以54千米/时的速度匀速前进.问列车要越过这列队伍,需多长时间?“有人说4克镁条在1克氧气中点燃,完全燃烧后生成5克氧化镁,符合质量守恒定律.”这句话错在哪里?大气中含量最多的元素是什么?以下各组物质都属于混合物的是()(A)...
英语翻译1.Bob shows great interest in physics and he wishes himself to become an Einstein one day.2.Americans eat twice as many as vegetables per person today as they did in 1910.3.Two third of the students in our class is from the south.4.He did
英语翻译1.Bob shows great interest in physics and he wishes himself to become an Einstein one day.2.Americans eat twice as many as vegetables per person today as they did in 1910.3.Two third of the students in our class is from the south.4.He did
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