题目内容
管式加热炉的对流室炉管一般采用？
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气体燃烧器按燃料与空气混合的情况，可分为？
管式加热炉在烘炉过程中150℃恒温是为了除去炉墙中的结晶水。
管式加热炉的热负荷主要由对流室担负。
Fill in the blanks with the information in your text-book. 每空一词In figurative expressions, the writer or speaker presents something through the use of unusual expressions for certain effect, such as ___1___, emphasis, and humor. The analogies in figurative language often involve one ___2___idea and one physical object.
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