抽当
抽当-
采用反向抽运，当入纤抽运功率为760W时，激光输出功率达到501W；
A CW output power of 501 W is obtained under pump power of 760 W with backward pumping scheme .
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覆盖型岩溶地区，由于采矿排水、供水抽汲地下水，当下降的水位低于基岩面时导致岩溶塌陷、开裂和沉陷，统称岩溶塌陷。
In covered ( hidden ) Karst areas , when the depressed water table is lowered than the bedrock due to mine drainage and pumping of ground water for water supply , collapse , cracks and surface subsidence occur , which are defined as Karst collapse in general .