A mathematical logic that attempts to solve problems by assigning values to an imprecise spectrum of data in order to arrive at the most accurate conclusion po···

　　钢琴价位一般是多少？钢琴通常分为立式钢琴和三角钢琴。　　立式钢琴：　　按照立式钢琴的档次，高档钢琴一般在7-8万左右，价格区间在5-10万之间，该规格中日本进···