文摘： 本文讨论导航与精确时间和时间间隔(PTTI)系统的相互关系。通过PTTI技术界如何利用奥米加、罗兰-C、子午仪和全球定位系统的实例,可看出导航系统在守时领域中所起的重要作用...
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Ptti lattice cookies 琪格饼干
For average adults, the excesses above the PTTI ranged from 20 to 40.
BBC: US rice imports 'contain harmful levels of lead'
Some samples exceeded the "provisional total tolerable intake" (PTTI) set by the US Food and Drug Administration (FDA) by a factor of 120.
"According to the FDA, they have to be more than 10 times the PTTI levels (to cause a health concern), and our values were two to 12 times higher than those 10 times, " he told BBC News.
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