温度变化得很慢，而且被控制在相对严格的范围内。
Changes in temperature occur slowly and are constrained within relatively tight bounds.
通过反应条件的控制，可制得不同聚合度范围的高相对分子质量的聚乙烯醇。
Through controls the reaction conditions, the high degree PVA with different range of degree is obtained.
在工业生产中，可根据实际分离需要选择相对经济的工艺条件，将平衡负载控制在合理的范围内。
For an industrial practice, however, the acid consumption and the number of stripping stage can be designed by choosing an economic process and controlling CLREs at a reasonable level.
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