班组领用维修材料和消耗用品，应本着（）原则控制在费用定额内，防止浪费。
参考答案：节约
-Why,Jack,you look so tired !
-Well,I ____ the house and I must finish the work tomorrow. [ ]
A. was painting
B. will be painting
C. have painted
D. have been painting
在宏观经济学中，劳动力被定义为年龄在（）岁以上的正在工作或者正在失业的人的群体。
A.14
B.16
C.18
D.20
