A major requirement of any longwall mine layout is that it provides the best possible financial performance, given the existing circumstances and limitations.
所有长壁矿井布置的主要要求是在现有环境和限制下提供最佳的可能财务业绩。
A major requirement of any longwall mine layout is that it provides the best possible financial performance, given the existing circumstances and limitations.
所有长壁矿井布置的主要要求是在现有环境和限制下提供最佳的可能财务业绩。
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