极软厚煤层
extremely-soft thick coal seam
高精度厚度控制
high-precision thickness control
密度-厚度联合补偿
Density-thickness joint compensation
三软中厚煤层
three soft in the thick coal seam
ISOCS无源刻度软件
ISOCS sourceless calibration software
单面单密度软磁盘
single-side single density floppy diskette
低透气松软煤层
low gas permeability crumby coal seam