In an abandoned theater, French actress Marina Vlady recites from Borges' "The Immortal"... Japanese research scientist Shin Kubota sings praises to the "immortal jellyfish"... Milan Duomo workers subject the cathedral's exquisite statues to perpetual regeneration... Swiss musician/inventors Felix Rohner and Sabina Schärer persistently refine their percussion instrument, the Hang... Native American community leaders Leola One Feather and Moses Brings Plenty preserve the centuries-old spiritual resistance of their tribe... Filmmakers Massimo D'Anolfi and Martina Parenti pay tribute to humankind's aspirations for immortality by showing us a portrait of our efforts to overcome our own limits. They share their discoveries in a visual symphony to the power and harmony of nature's elements: water, earth, air and fire. From Milan to Wounded Knee, USA, from Bern to Shirahama, Japan, the traces of the filmmakers' travels spiral into a symbol of perfection and infinity: Spira Mirabilis.
(《螺纹》纪录片于2023-04-10 13:57由 2022手机版高清影视在线-众电影院收集自网络发布。)In an abandoned theater, French actress Marina Vlady recites from Borges' "The Immortal"... Japanese research scientist Shin Kubota sings praises to the "immortal jellyfish"... Milan Duomo workers subject the cathedral's exquisite statues to perpetual regeneration... Swiss musician/inventors Felix Rohner and Sabina Schärer persistently refine their percussion instrument, the Hang... Native American community leaders Leola One Feather and Moses Brings Plenty preserve the centuries-old spiritual resistance of their tribe... Filmmakers Massimo D'Anolfi and Martina Parenti pay tribute to humankind's aspirations for immortality by showing us a portrait of our efforts to overcome our own limits. They share their discoveries in a visual symphony to the power and harmony of nature's elements: water, earth, air and fire. From Milan to Wounded Knee, USA, from Bern to Shirahama, Japan, the traces of the filmmakers' travels spiral into a symbol of perfection and infinity: Spira Mirabilis.
螺纹按其截面形状（牙型）分为三角形螺纹、矩形螺纹、梯形螺纹和锯齿形螺纹等。其中三角形螺纹主要用于联接（见螺纹联接）。 螺纹分布在母体外表面的叫外螺纹，在母体内表面的叫内螺纹。 279759ee3d6d55fb59957fca63224f4a21a4dd8f 国家标准规定的标准： 螺纹标注方法中，第一个字母代表螺纹代号，例如：M表示普通螺纹、G表示非螺纹密封的管螺纹、R表示用螺纹密封的管螺纹、Tr表示梯形螺纹等。第二个数字表示螺纹公称直径，也就是螺纹的大径。 以上内容参考：
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