X线管套内绝缘油的作用是
A.润滑
B.防锈
C.绝缘
D.散热
E.填充
参考答案:C,D
解析:绝缘油的作用一是增加管套内有限空间的绝缘能力,二是提高X线管的散热效率。
English is one of _____ important subjects in our school. [ ]
A. most
B. the most
C. more
D. much more
朱砂具有(),()之功。