公雞吃了威而剛
ISO 898 - Wikipedia, the free encyclopedia一位農場主花了很多錢買了一批母雞,想靠賣雞蛋賺錢。不料母雞一個個無精打采,總是不生蛋。他很著急,去請教專家。 專家問明情況以後,告訴他說: "雞也是動物,也有生理需求,所以你應該再去買一批公雞"。 可是農場主已經花了很多錢,口袋裏的錢只夠買一隻公雞的了。 沒辦ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [1] It is div...
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