Roadway heading is the forerunner for clearly knowing coal bed geological conditions.

  • 掘进巷道是全面、准确了解矿井煤层地质条件的先导.

  • 互联网摘选 2025-01-19 23:17:13

    • 相关例句
    精确
    • 模糊
    • 词首
    • 词尾
    • 词义
    • 例句