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- What are the purposes of helium and nitrogen gas? 氦气与氮气在这套系统中有何作用？
- If it were not for oxygen and nitrogen in the air, no man could live on the earth. 大气中如果没有氧和氮，人就无法生存于地球了。
- Enrichment of organic matter and nitrogen in eroded bedloads. 侵蚀泥沙、有机质和全氮富集规律研究。
- But overdoses of sulfur and nitrogen cause crop damage. 但过量的硫磺和氮气却会造成收成的损害。
- They say much of the soil lacks enough phosphorus and nitrogen. 他们说当地的大部分土壤缺乏足够的磷和氮。
- The micropore diffusiviites of oxygen and nitrogen are obtained. 求得了氧、氮的扩散系数。
- They say much of the soil lacks enough phosphorus and nitrogen . 这些专家们认为许多土壤都缺少足够的磷和氮。
- A reddish-brown phosphate mineral containing rare-earth metals, (Ce, La, Y, Th)PO4, important as a source of cerium and thorium. 独居石一种含有稀土（铈、镧、钇、钍）的浅红褐色磷矿，分子式为PO4，它是铈和钍的重要来源
- A reddish - brown phosphate mineral containing rare - earth metals(Ce,La,Y,Th)PO4,important as a source of cerium and thorium. 独居石一种含有稀土(铈、镧、钇、钍)的浅红褐色磷矿，分子式为PO4，它是铈和钍的重要来源
- A reddish - brown phosphate mineral containing rare - earth metals(Ce,la.Y,Th)PO4,important as a source of cerium and thorium. 独居石一种含有稀土(铈、镧、钇、钍)的浅红褐色磷矿，分子式为PO4，它是铈和钍的重要来源
- A reddish-brown phosphate mineral containing rare-earth metals,(Ce, La, Y, Th)PO4, important as a source of cerium and thorium. 独居石一种含有稀土（铈、镧、钇、钍）的浅红褐色磷矿，分子式为po4，它是铈和钍的重要来源
- Change of phosphorus and nitrogen concentration in the leakage loss. 渗漏流失氮磷浓度的变化。
- The golden and ultraviolet-absorbed glass used cerium and titanium as the colorant by the sol-gel process meets the people’s requirement. 采用溶胶-凝胶法制得氧化铈和氧化钛混合着色的金黄色、吸收紫外线玻璃，一定程度上满足了人们多功能玻璃的要求。
- This study is about carbon and nitrogen nutrient sources utilization. 摘要通过试验探讨茶树菇对碳源和氮源的利用。
- External gauge panel and nitrogen fill port for hands free tire inflation. 外部评估小组和氮填补港口为免提轮胎通货膨胀。
- Objective Study of the influences of lanthanum, cerium and fluoride on the activity of glucosyltransferase (GTF) and adherence of oral cariogenic bacteria. 摘要目的为观察镧、铈和氟对葡糖基转移酶活性和口腔主要致龋粘附的影响。
- Oxygen permeance and nitrogen gas permeance of materials should be tested. 氧渗透和氮气渗透的材料，应进行测试。
- The influences of cerium and its carbide on the strength, plasticity, impact toughness and other mechanical properties of steels were investigated through experiments and tests. 通过金相、扫描电镜能谱分析和冲击、拉伸等实验方法,研究了钢中铈及其碳化物对强度、塑性、冲击韧度等力学性能的影响。
- Synthesis of dibromo-p-methyl-methylsulfonazois described and its color reactions with calcium,strontium, barium,lanthanum, cerium and lead invarious acid media have been studied. 新显色剂二溴对甲基偶氮甲磺的合成方法，并研究了该试剂在磷酸、盐酸、硝酸介质中与钙、锶、钡、镧、铈铅的显色反应。
- One obvious remedy is to reduce emissions of sulfur and nitrogen oxides to the atmosphere. 减少硫氧化物和氮氧化物向大气的排放量是一个有效的治理措施。
