“混凝土”中的轻质粗、细集料是一种组织疏松、多孔的天然碳酸钙结核。
Both of the coarse and fine light-weight aggregates in the concrete were natural calcium carbonate nucleations with loose and porous structure.
锰结核的主要矿物是具有隧道孔结构的钙锰矿以及具有层状结构的似水锰矿和水钠锰矿。
The major components of manganese nodules are todorokite with a tunnel-like structure and also buserite and birnessite with layered structures.
目的：探讨老年肺结核患者血清钙水平的改变与若干因素的关系。
Objective:To study factors influencing serum total calcium concentration in elderly tuberculosis patients.
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