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draw slate
释义
draw slate
draw slate
[
′drȯ ‚slāt
]
(mining engineering)
A soft rock, 2 inches to 2 feet (5 centimeters to 0.6 meter) thick, that lies above a coal seam and falls with the coal as it is excavated, or soon after.
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更新时间:2026/6/3 6:45:35