![smokeless powder造句怎么写]( "smokeless powder造句怎么写")
- Acellulosenitrateusedasacomponentofsmokelesspowder.nitrocellulosecontainingarelativelylargeamountofnitrogen;highlyexplosive;usedinmakingsmokelesspowder.Itbecameobsoleteinthe1880swhentheinventionofsmokelesspowderledtodevelopmentofatrulyautomaticmachin...
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