绝缘材料按耐热等级分为7个等级,变压器中所用的绝缘纸板和变压器油都是A级绝缘,其耐热温度是()。
A.85℃;
B.95℃;
C.105℃;
D.120℃。
参考答案:C
The Smiths moved to China ten years ago and here since then. [ ]
A. has lived
B. was living
C.live
D. have lived
1992年后,联合国扩大了的维和行动新战略由预防性外交、()几个相互关联的部分有机组成。
A.派驻维和部队
B.部署观察团
C.冲突后缔造和平
D.建立和平
E.维持和平