以“梁”的理论为依据，确定房柱式采煤法的基本结构煤房和煤柱的参数及计算公式。

On the theory of "beam", the basic structure, parameters and formula for rooms & pillars have been educed.

youdao

以“梁”的理论为依据，确定房柱式采煤法的基本结构煤房和煤柱的参数及计算公式。

On the theory of "beam", the basic structure, parameters and formula for rooms & pillars have been educed.

youdao