low-grade ore是什么意思

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用法例句

To study the performance and application value of low grade cotton and make full use of resources,the performances of low grade cotton with high moisture and foreign impurities have been tested and analysed.

为探讨低级棉的性能与应用价值,合理利用资源,对高含水、高含杂低级棉的性能进行了测试和分析。

The dissimilar technologies of synthesis and characteristics for acetic low-carbon-ester and it's catalyzer areintroduced in this paper, and the use, market-trend of low-carbon-ester and acetic production status are summarized.

本文概述了醋酸低级醇酯产品的用途和市场趋势及原料醋酸的生产现状,重点介绍了醋酸低级醇酯系列产品的不同合成方法及其特点,并对所用催化剂的特点及制备技术进行了综述。

PP cigarette filter with good physical properties and high filterability to low grade aldehyde and tar were got by spraying chemical adsorbent on the modified PP tow.

通过采用过氧化物降温母粒提高聚丙烯的可纺性 ,添加 β晶型成核剂母粒和不相容树脂共混纺丝 ,得到具有多孔结构的改性纤维 ,并在改性纤维表面喷涂化学吸附剂的方法 ,使聚丙烯滤嘴既具有良好的物性指标 ,又对低级醛类和焦油等具有较高的过滤性能 ,明显减轻了聚丙烯滤嘴香烟的辛辣口