Vim li cas thiaj xaiv cov no?Ib yam zoo rau cov tub rau khoom nrog cov ntsiab lus hnyav, xws li cov khoom siv nyiaj lossis cov cuab yeej.Full-extension range tso cai rau lub tub rau khoom qhib tag nrho rau kev nkag tau zoo tshaj plaws rau cov ntsiab lus hauv qab. Tsawg-nqi, 3⁄4 extensions qhib kom nthuav tawm tag nrho tab sis sab nraub qaum