Lathing Rau Npauj Npaim Valves Sab Saum Toj Flange
Tho Qhov Rau Cov Vuas Npauj Npaim Lug
Cov txiaj ntsig ntawm lub tshuab ntsuas spectrometer
Cov Khoom Siv Ua Haujlwm Tshuab
Kev Ncig Saib Hoobkas