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双韧管状中柱
释义
双韧管状中柱
Encyclopedia
理学
〔植物形态与结构〕
释
amphiphloic siphonostele
双韧管状中柱
环状木质部的内、外两边均有韧皮部的中柱。中央具髓的管状中柱的一种。如蚌壳蕨属(Dicksonia)植物根状茎中的中柱。
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user research
users and interactive information retrieval
users authentication authorization
user's collaborative information retrieving behavior
users'cost of fisheries resources
user's diary description
user's exploratory searching behavior
user's perspective study
user's psychology-behavior control mechanism
user stack
user study
user survey method
uses and gratifications approach
U set
U-set
Use the Language of the Motherland Correctly, Fight for the Purity and Health of the Language!(Editorial)
use value
use value of forest resource
use value of resources
U.S.FDA
USFDA
U.S. Federal Aviation Administration
U.S. Food and Drug Administration
U.S. Government Publishing Office
U.S.Government Publishing Office
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