问题
选择题
I’d rather read than watch television; the programs seem ___________ all the time.
A.to get worse
B.to have got worse
C.that it is getting worse
D.to be getting worse
答案
答案:D
I’d rather read than watch television; the programs seem ___________ all the time.
A.to get worse
B.to have got worse
C.that it is getting worse
D.to be getting worse
答案:D
某公司决定从甲、乙、丙三个工厂共购买100件同种产品A.计划从丙厂购买的产品数量是从甲厂购买的产品数量的2倍;从丙厂购买的产品数量的
(1)设从甲厂购买x件产品A,从乙厂购买y件产品A,请用列方程组的方法求出该公司从三个工厂各应购买多少件产品A; (2)已知这三个工厂生产的产品A的优品率分别为甲:80%;乙:85%;丙:90%,求快乐公司所购买的100件产品A的优品率; (3)在第(2)题的基础上,你认为该公司在购买总数100件不变的情况下,能否通过改变计划,调整从三个工厂购买产品A的数量,使购买产品A的优品率上升2%?若能,请求出所有可能的购买方案;若不能,请说明理由(各厂购买的优品件数是整数). |