Solve of the optical issue that occurred in production.
解决生产中遇到的有关光学问题。
A mine water disaster is a natural disaster often occurred in mine construction and production.
水患是矿山建设和生产中经常遇到的自然灾害。
Lumber production and total production occurred in predictable ratios to one another.
因为木材生产量与总产量之间出现了可预测的比例关系。
Lumber production and total production occurred in predictable ratios to one another.
因为木材生产量与总产量之间出现了可预测的比例关系。
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