出转化废锅转化气温度为什么控制小于600℃？

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答案

参考答案：

若高于600℃，则废锅易发生干锅现象，尤其废锅热端过热后，强度下降列管容易漏，另外使所以一般控制废锅出口温度低于600℃。

阅读理解

阅读短文，根据内容判断正 (T) 误 (F)。

A rich man wants to give his mother a birthday present, but what will be the best one? One day he finds

an amazing bird in the market. It can talk in twelve languages and sing ten famous operas. Immediately he buys

the bird and sends it to his mother. It costs him $50,000. The next day he phones to his mother, "What do you

think of the bird, mother?" "Oh, it's very delicious." His mother answers.

( ) 1. The rich man sends his mother a bird for birthday.

( ) 2. The bird is very clever.

( ) 3. The bird can sing and dance.

( ) 4. The bird is very expensive.

( ) 5. The rich man's mother eats the bird.

问答题

《旅游法》中对住宿经营者的有关规定是什么？