第一、二种工作票和带电作业工作票只能延期一次。
参考答案：错
解析：第一、二种工作票只能延期一次,带电作业工作票不能延期
根据括号内所给中文写出正确的单词。
1. All my classmates in this school are very _____. (有礼貌的)
2. We have a computer lesson on _____ morning. (星期四)
3. The tall boy over there is good at _____. (游泳)
4. Do you often have dinner at your _____ home at the weekend? (祖父母)
5. There are _____ boys in my class. (二十)
氢火焰离子化检测器是依据不同组分气体的热导率不同来实现物质测定的。( )
