根据句意和首字母提示完成下列句子。There are sixty m____ in an hour.He is ill, and his i____ makes us feel sad.A lot of t____ are visiting the Great Wall, so it is very crowded.Good food and e____ help me to study better.It is n____ to eat a balanced diet.
若|m﹣3|+(n+2)2=0,则m+2n的值为( )
某实验小组要探究力对物体做功与物体获得速度的关系,选取的实验装置如图1所示,实验主要步骤如下:
句型考查
现在电动自行车、电动汽车逐渐普及,它们都采用电动机来获得动力。某直流电动机的铭牌上标有“220V 5.5kW”,电动机线圈的电阻为0.4Ω.