硫磺着火后遇大火时切勿将水流直接射至熔融物，以免引起严重的流淌火灾或引起剧烈的沸溅。消防人员须戴好防毒面具，在安全距离以外，在上风向灭火。
参考答案：对
同义句转换。
1. Li Ming works hard. The fact is well known to us all.
_____ Li Ming _____ is well known to us all.
2. He failed the exam. The news surprised us greatly.
_____ he failed the exam surprised us greatly.
3. He suggested the meeting be delayed, but was turned down.
_____ the meeting _____ was turned down.
4. When will he start? I have no idea about it.
I have no idea ______.
5. "Is the work worth doing?"This is the question he asked me.
He asked me the question _____ worth doing.
