以下（）属于电力变压器的不停电检修。
A.A类检修
B.B类检修
C.C类检修
D.D类检修
参考答案：D
岗位分类的缺陷是（）。
A.不适合通用性强的岗位
B.不适合高级管理或技术岗位
C.不适合机密性岗位
D.不适合要求创新能力高的岗位
E.不适合专业性较强的中级岗位
If of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 4 strokes ？（）
A.A
B.B
C.C
D.D
E.E
of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 4 strokes ？（）