移动供气源使用者佩戴好装具必须经监护人检查合格后方可进入作业现场。
参考答案：对
—How should I deal with new words in reading?
—Well, you’d better not stop you come to a word or a phrase you don’t know.
A．one time
B．the time
C．every time
D．a time
汽油机一个工作循环由吸气、压缩、做功、排气四个冲程组成，其中做功冲程是将______能转化为______能．
