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结缚在网衣上方边缘或网口上缘的纲索。是渔具的重要构件。其作用是使网衣上方或网口获得一定形状和尺寸,并承受一定的外力。常见的上纲包含网衣上方边缘为结缚浮子而装配的纲索,称为浮子纲;以及为增加网衣上方边缘强度的纲索,称为上缘纲。
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essence of viscera
essence, qi and spirit
ESSENCE supernova survey
ESSENCE超新星巡天
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Essential Account on Calligraphy
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essential amino acid index
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