垄断低价一般是()
A.垄断组织出售商品时规定的价格
B.垄断组织购买原材料时规定的价格
C.非垄断组织必须接受的市场购买价格
D.非垄断组织必须接受的市场收购价格
参考答案:B
______ by his grandparents in the countryside, he isn’t used to _______ in the city.
A.Having brought up, live
B.Grown up, living
C.Growing up, live
D.Brought up, living
换热器的壳程为什么要安装挡板?