橡皮绝缘导线运行最高温度是：（）
A、65℃。
B、70℃。
C、80℃。
参考答案：A
The teacher was satisfied __the progress he had made,because he rid himself ___ being lazy and careless.
A．about;of
B．with;from
C．with;of
D．at;off
论述除铁器有哪几种形式？带式除铁器有哪些常见的故障？如何处理？
