答案:Any weight item removed is a minus weight and any weight item added is a plus weight. Multiplying a weight by an aim will result in a plus moment if the signs are alike and minus moment if the signs are unlike. 移除的任何重量项目都是负重量,添加的任何重量项目都是正重量。如果符号相同,则将权重乘以目标将产生正力矩;如果符号不同,则将产生负力矩。