单词	coal mine drainage
释义	coal mine drainage 煤矿排水
随便看	optical testing instrument optical testing techniques optical testing with laser optical tests optical test technique optical test wedge optical texture optical the length optical theodoite optical theodolite optical theorem optical theory optical thermal analysis optical-thermal interaction effect optical-thermal model optical thermometer optical thermometry optical thickness optical thickness gauge optical thickness measurer optical thickness moninitor Optical thickness monitoring optical thickness tolerances optical thinfilm optical thin film