一根体积是56.8立方分米的圆柱形钢材,把它的长度按1:3的比例截成两段后,表面积增加了14.2 平方分米。这两段钢材的长度分别是( )分米 和( )分米。
2:6
--The cake is too expensive. Would you like to show me a _______one?
--Sure. Here you are.
A. cheap B. cheaper C. cheapest
糖度调整时怎样加糖?