在烟道内进行工作时,必须()的人孔门以保证足够的通风。
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_____ warned of the danger of losing his way in the jungle, he still wanted to have an adventure. [ ]
A. To be
B. Being
C. Having been
D. Having
维修记录的填写在原则上不允许更改,如需更改()
A、由填写人使用单横线将其划掉,并在附近填写正确内容,签署姓名及日期。
B、用笔将错误处涂黑
C、用涂改液进行涂改
D、用纸条粘贴后重写