次要元素 meaning in Chinese

minor element

Standard test method for major and minor elements in coal and coke ash by x - ray fluorescence
X -射线荧光法测定煤和焦炭灰分中主要和次要元素的标准试验方法
Standard test method for major and minor elements in combustion residues from coal utilization processes
煤利用过程中燃烧残留物中主要和次要元素的标准试验方法
Standard test method for determination of major and minor elements in coal , coke , and solid residues from combustion of coal and coke by inductively coupled plasma - atomic emission spectrometry
感应耦合等离子体-原子发散光谱法测定由煤和焦炭燃烧产生的煤焦炭和固体残留物中主要和次要元素的标准试验方法