【单选题】I think watching TV is very . You can really learn a lot.
【单选题】(2013·高考天津卷)I think watching TV every evening is a waste of time—there are________ meaningful things to do.
【单选题】物品本身是难燃,但其包装材料易燃,该类火灾危险属于( )类。
【简答题】已知行列式的第一列的元素为1,4,-3,2,第二列元素的代数余子式为2,3,4, x 问x=
【简答题】I think watching TV is a ______ (浪费)of money.
【简答题】I think watching TV is (boring)thing at home.
【多选题】根据储存物品的火灾危险性分类,下列所述属于甲类储存物的是( )
【简答题】四阶行列式的第二行元素分别为 ;第四行对应元素的代数余子式值分别为 ,则 的值是____。
【单选题】I think watching TV every evening is a waste of time---there are _______ things to do.