graphite bar electric furnace

例句：

1. 1. The graphite barwas used to heat the metal during themanufacturing process.
   石墨棒用于在制造过程中加热金属。
2. 2. The graphite bar was a criticalcomponent in the design of the furnace.
   石墨棒是炉设计的关键部件。
3. 3. The graphitebar was carefully placed inside the furnace toensure optimal heating efficiency.
   石墨棒被小心地放置在炉内，以确保最佳的加热效率。