大功率X射线管阳极冷却的常用方法是（）
A、辐射冷却
B、对流冷却
C、传导冷却
D、液体强迫循环冷却
参考答案：D
— Jack,you seem in highspirits.
— _____ We won the match 4-0. [ ]
A. Guess what?
B. So what?
C. No wonder.
D. No double.
异常构造
