旋转阳极X线管阳极散热主要靠
A.传导
B.辐射
C.涡流
D.对流
E.吸收
参考答案:B
解析:靶盘的热量主要通过热辐射散发出去,被管外的绝缘油吸收。
There's _____ in the storybook.[ ]
A. interesting things
B. nothing interesting
C. anything interesting
D. interesting nothing
园林绿地中施肥的作用?