99.9999999999%
็ดๅบฆ99.9999999999%(twelve nine)
ๅๅฐไฝๅคงๅฅฝใ
ใปใผไธ็บๆใใใใณๅ ฅใใใใฉใใใ
ใใใใๆฅตใใใ(3/23)
ๅๅฐไฝๅคงๅฅฝใ
ใปใผไธ็บๆใใใใณๅ ฅใใใใฉใใใ
ใใใใๆฅตใใใ(3/23)