请输入您要查询的字词:
单词
乳齿象
释义
乳齿象
Encyclopedia
理学
哺乳纲(化石)
释
mastodont
乳齿象
狭义的作为一个属名,现在被认为是玛姆象属(Mammut)的同物异名,在分类学上已被弃置不用,仅作为美洲乳齿象(Mammut americanum)的通称。而广义的曾经被作为一个超科分类单元,包括了从晚渐新世到更新世的多种象类。随着系统演化理论和支序分系方法的兴起,乳齿象这一并系的类群逐渐被拆解,最终不再成为正式的分类单元。从现在的分类角度,广义的乳齿象类包括现在的古乳齿象类、玛姆象类、嵌齿象类,以及剑齿象类和真象类的最原始的成员。
随便看
Rationed Tribute
ration grazing
ratio of centralized water supply
ratio of consumption wastes treated
ratio of division
ratio of external division
ratio of greater inequality
ratio of internal division
ratio of magnification
ratio of monofilament deviation
ratio of Output-to-input
ratio of oxygen to uranium
ratio of patient beds
ratio of progression
ratio of similitute
ratio of specific heat capacity
ratio of surface area
ratio of survival
ratio of tea polyphenols to amino acids
ratio of the circumference of a circle to its diameter
ratio of transportation accident
ratio of wool yield to liveweight
ratio of yield point to plastic viscosity
ratio paper
ratio parameter
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。
Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号
更新时间:2025/12/8 20:38:19