Q表示产量,成本C(Q)=100+13Q，单价p，需求量Q(p)=800/P+3-2则工厂取得利润最大时的产量为_____
8
元朝管辖西藏地区事务的机构 ()
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
对农业的社会主义改造坚持的基本原则有_______。
The farmer had to wear heavy boots in the winter because the fields were too wet and________.
设向量组
线性无关，则下列向量组线性相关的是（）
