1千克棉花比1千克盐轻. (判断对错)
把5克盐放入100克水中配成盐水,盐水的含盐率是5%. .(判断对错)
1千克棉花比1千克铁球轻. .(判断对错)
1吨铁比一吨棉花重 (判断对错)
1000千克的棉花比一吨的铁轻. .(判断对错)