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подошва пласта
stresses
geol.
层底
;
地层底界
;
底盘
;
煤层底板
;
下盘
;
岩层底
;
岩层底板
;
矿层底
;
层底岩层底板
;
地层底面
tech.
底部
;
矿层底板
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