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碳黑洗涤塔出口CH4含量高说明什么问题？应作何处理？

答案

参考答案：

CH4含量高说明气化炉燃烧室温度较低，气化不够完全，应逐步提高气化炉燃烧室温度，使其达到正常值150ppm。

改错题

指出错误并改正。

l. We'll never forget the days when we spent together in the mountain village.

   ______________________________________________________________

2. Do you still remember the village where we paid a visit to last summer?

    ______________________________________________________________

3. This is the best hotel that I have ever stayed.

    ______________________________________________________________

4. I don't believe the reason why he gave us for his absence from the meeting.

    ______________________________________________________________

5. We have come to a point when we have to make a decision by ourselves.

    ______________________________________________________________

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飞机火灾具有哪些特点？
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