Every morning Steve went to work by train. As he has a long trip，he always buys newspaper. It helps make the time passing more quickly. One Tuesday morning，he turned over the sports page. He wanted to see the report about an important football match the night before. The report was so interesting that he forgot to get off at his station. He did not know it unless he saw the sea. He got off at the next station，but had to wait a long time for a train to go back. It was no doubt that he arrived late at the office. His boss was angry when Steve told to him why he was late.“Work is very important than football!” he shouted.

井下电气设备在（）、（）、（）时应由二人协同作业，相互监护。