排序方式： 共有2条查询结果，搜索用时 0 毫秒
1
1.
四川之鹽滷,蘊藏豐富,產銷暢旺,為中國西部一種重要之鑛產。關於川鹽之歷史,行政,稅收以及鑿井机械與方法,均有詳細之記載,而滷鑛之地質及產狀,則向少研究。迨三四年前, 相似文献
2.
INTRODUCTION During the last decades, the processes of enrichment of sulphide ores have been extensively studied in the geological laboratory. The work was chiefly done on copper, silver, and gold deposits. The secondary enrichment of tin sulphide has not been observed in the field; but it is believed by many 相似文献
1