【Ke kūʻai maikaʻi loa ma Iulai】Mekini hoʻomaʻamaʻa ikaika me ka respirator

Hoʻolālā ʻia a hana ʻia ka mīkini respirator mechanical strength pretreatment e like me nā kūlana kūpono, a hoʻohana nui ʻia no ka vibration mechanical strength pretreatment o nā mea kānana hiki ke hoʻololi.