It has 10 years history since China carried out coal resource exploration supervision, but no quantifying indices have been set up for supervision quality control.
我国煤炭资源勘探监理已有10年历史，但至今没有建立煤炭资源勘探监理质量控制量化指标。
It has 10 years history since China carried out coal resource exploration supervision, but no quantifying indices have been set up for supervision quality control.
我国煤炭资源勘探监理已有10年历史，但至今没有建立煤炭资源勘探监理质量控制量化指标。
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