生意社商品价格指数，不仅可用于反映商品价格变化，也可为更多的产业人士提供商品定价参考。其原理如下： 对商品价格的月末价与商品的月初价进行比较，如果月末价较月初价上涨，即用红柱；如果月末价较月初价下跌，即用绿柱。 K柱应用： 用于帮助原 ...

U.S. forces carried out an audacious raid in Venezuela, seizing its president, Nicolás Maduro. We invite students to explore what happened and share their reactions. By Natalie ProulxMichael Gonchar ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. On Jan. 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the ...