高压断路器常见故障有哪些(按发生频率排列大致顺序)?
参考答案:
(1)密封件失效故障;
(2)动作失灵故障;
(3)绝缘损坏或不良;
(4)灭弧件触头的故障。
— I think you'd better type this letter again before Mr. Smith see it.
— Oh, dear! _____ [ ]
A. Who cares?
B. No problem
C. I don't mind at all
D. Is it as bad as that?
大卫·李嘉图的代表著作是()
A.《国富论》
B.《国际贸易》
C.《域际和国际贸易》
D.《政治经济学及赋税原理》