水平螺旋管逆流层析仪 horizontal flow-through coil planet centrifuge for counter current chromatography
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锅炉的燃烧器由船形改为水平浓淡形，空气预热器由回转式改为螺旋管式。
The burners of boiler A were revamped from boat type to horizontal condense dilute type, the air preheater revamped from rotary to scrolled.
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