题型:问答题 简答题 Swimming is my favorite sport. There is _____ like swimming as a means of keeping fit. [ ]A. something B. anything C. nothing D. everything 查看答案
题型:问答题 简答题 如图(a)所示,某人借助定滑轮将质量为m的货物提升到高处,测得货物加速度a与绳子对货物拉力FT之间的函数关系如图(b)所示。不计滑轮的摩擦,则:(1)图线与横轴的交点N数值的含义为:___________________;(2)图线斜率的含义为:_____________________。 查看答案