【单选题】光纤规格62.5/l25中的62.5表示( )。
【判断题】当两种商品中一种商品的价格发生变化时,这两种商品需求量都同时增加或减少,则这两种商品的需求交叉价格弹性系数为正
【简答题】Around Autumn Equinox, farmers all over the country begin to experience sanmang , which means they are extremely busy with harvesting, plowing, and ______.
【单选题】_____ you're talking to one person or one hundred, always remember to look at them.
【单选题】红、__________、白三色为圣诞色。