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十字蕨目
小灌木,立体分枝,无叶片,产顶生孢子囊,主轴、侧枝和羽轴横切面初生木质部呈十字形的一类真蕨植物化石。
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system of reference
system of releasing environmental state report
system of representatives
system of residues
system of resultants
system of river conservancy administrations in ancient China
system of roots
system of rural five-guarantee household
system of San Gong Jiu Qing
System of Seal and Commander's Tally
system of secret appointment of crown prince
system of segmental repair and defense of embankments
system of selecting of ficers in ancient China
system of separating lending survey from loan review and loan origination
system of sets
system of shares in enterprises
system of signs
system of solutions
system of special protection of labour for underage worker
system of spherical coordinates
system of strongly elliptic equation
system of strongly elliptic equations
system of subgroups
system of submanifolds
system of subvarieties
科学参考收录了854744条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。
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