pearl hardening是什么意思

用法例句

Experimental study on effect of acetic acid and carbonic acid on clay’s geotechnical behaviors;

乙酸和碳酸对粘土土工性状影响的试验

The source,existing form and equilibrium of carbonic acid in natural water are presented in this article,which points out that alkalinity is determined by double indicator that indicates purply at the first terminal point,while at the second terminal point should use methyl red-bromocresol green mixed indicator.

介绍了天然水体中碳酸的来源、存在形式及平衡关系;指出用“双指示剂”法测定水中碱度的第一终点应显粉紫色,第二终点宜采用甲基红-溴甲酚绿混合指示剂;测定游离二氧化碳要用双样测定并严格控制滴定终点;各种碳酸的含量可与pH值、硬度的测定结果进行校核。

Research on Mechanical Properties of Microcellular Polycarbonate Foaming Material;

聚碳酸酯微孔泡沫塑料力学性能的研究

Analysis of Polycarbonate Production Statement in World;

国内外聚碳酸酯的生产状况比较分析

Application and market forground of calcium carbonate in china;

我国轻质碳酸钙应用的市场前景

Progress on the application of calcium carbonate in plastics;

碳酸钙在塑料中应用进展

Morphologies of calcium carbonate crystallites grown from aqueous solutions containing polyethylene glycol;

聚乙二醇对碳酸钙晶体生长影响的研究