石松纲
- 与 石松纲 相关的网络例句 [注：此内容来源于网络，仅供参考]
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The middle and upper layers may be composed of Lepidodendron , Cordaites, Calamites and some tree ferns or seed ferns.
群落的中、高层通常是石松纲和科达纲，楔叶纲中Calamites及某些树蕨和种子蕨。
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Eusporangiate Describing the condition, found in clubmosses, horsetails, and certain ferns in which the sporangia develop from a group of initial cells and do not have an elaborate spore dispersal mechanism.
厚囊蕨：用来描述发现于石松纲、木贼类以及一些蕨类植物，其孢子囊由一组原始细胞发育而来，没有复杂的孢子散布机制。
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On this basis, the cladistic analysis (Kenrick and Crane, 1997) recognized three lineages among the vascular plants (including the fossil and living plants): the Lycophytina, Euphyllophytina and Rhyniopsida.
在此基础上，Kenrick和Crane（1997）根据分支系统学的分析将维管植物划分为三个谱系：石松植物亚门，真叶植物亚门和莱尼蕨纲。
- 推荐网络例句
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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.
主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。
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Male cats normally do not need aftercare with the exception of the night after the anesthetic.
男猫通常不需要善后除了晚上的麻醉。
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Its advantage is that it can be used in smaller units.
其优点在于可以在较小的单位中应用。