small and medium sized boiler

• 中小型锅炉

small and medium sized boiler的用法和样例：

例句

1. The layer burning industrial boilers discussed in this paper are mainly small and middle boilers which use chain grate as their burning device.
   本文所讲的层燃式锅炉，主要是以链条炉排作为其燃烧装置的中小型锅炉。