（一）故意干扰无线电业务正常进行的；
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В Финляндии предупредили об опасном шаге ЕС против России09:28，推荐阅读同城约会获取更多信息
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it: