一般说来，设备的经济寿命年限短于设备的自然寿命年限。
题型：判断题
问题：
一般说来，设备的经济寿命年限短于设备的自然寿命年限。
题型：判断题
根据下 * * 幅图画所提供的语境，在文中空格处填上一个适当的词。
1. One morning, Jack saw a blind man _____ across a street on his way to school. A car was going
to _____.
2. Jack ran up to him and _____ him back. The man _____ saved.
3. Then Jack took him to the other _____ of the street. The man thanked him for _____ that.
4. But Jack didn't wait for his thanks. He went to school at _____. It was late. The _____ class had been
on.
5. After Jack told his teacher _____ had happened. "Well done, Jack" said the teacher _____ a smile.