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鱟科
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鱟科
hòu kē
节肢动物门节口纲剑尾目动物的统称。躯体分为头胸部、腹部和尾剑，有关节相连。头胸部有半圆马蹄形之背甲覆盖，腹部内凹，脚须与脚分六节，颊角则分三节。出现于距今约四亿年前的古生代奥陶纪。今之鲎科仅存三属五种。
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trial pit
trial plant
trial plantation
Trial Planting
trial plate
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trial plot
trial point
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trial practice courses
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trial prediction diagram
TRIAL PREPARATION OF MATTE GLAZE
trial presentation
trial prices
trial print
trial procedure
trial procedures
trial process
trial-process
trial production
trial-production
Trial-Production
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更新时间：2026/8/23 21:35:33