Water and dust resistance rating
Nevertheless, by 1905, a report on the seaweed industries in Japan noted the “very important use [of pure-grade agar] as a culture medium in bacteriological work.” It’s safe to say that, around the turn of the 20th century, agar had moved from an inconspicuous kitchen jelly to an indispensable scientific substance.
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The standard practice of normal laws is to prevent recklessness that could lead to a catastrophe, even if no real harm has occurred yet. Reckless driving, reckless endangerment, and many safety violations are punishable regardless of whether anyone gets hurt; in civil law, injunctions can stop dangerous behaviour before harm occurs.，推荐阅读爱思助手下载最新版本获取更多信息
version 3, see the Copyright file.