(1) Lub tshuab nqus tsev hnub ci siv nyob rau hauv cov khoom siv dej hnub ci hauv tsev tau muab faib ua 37, 47, 58, 70mm, thiab lwm yam raws li cov yeeb nkab taub, thiab 1.2, 1.5, 1.6, 1.8, 2.1, 2.3m, thiab lwm yam raws li qhov ntev.
(2) Raws li cov txheej txheem ntau lawm, tau muab faib ua: hnub ci dog dig clarinet, raj xiav zoo nkauj; peb qhov siab xiav lub raj, peb siab kub lub raj kub
