Open-loop unstable system with time delay is difficult to control using routine control methods.
开环不稳定时滞系统是工业现场中常见的一类被控过程，这类系统控制难度高，控制精度难以保证。
Normally it is difficult to obtain a satisfactory result of control by routine control method because there are many deciding factors of coaling.
因为决定喂煤量的因素很多，按照常规的控制方法很难达到满意的控制效果。
The choices of control method are key factors that influence stabilizer effect of passively controlled anti-rolling tank mainly, by comparing optimal control method with routine control method.
通过常规控制方法和最佳控制方法的比较，指出控制方法的选取是关系到可控被动式减摇水舱减摇效果的关键环节。
Conclusion Routine control strategies such as selective chemotherapy combined with livestock chemotherapy, snail control in risk areas have a positive impact on the control of schistosomiasis.
结论采取选择性人畜化疗、易感地带灭螺等常规防治措施控制血吸虫病病情可取得一定成效，但应长期坚持。
Conclusion Routine control strategies such as selective chemotherapy combined with livestock chemotherapy, snail control in risk areas have a positive impact on the control of schistosomiasis.
结论采取选择性人畜化疗、易感地带灭螺等常规防治措施控制血吸虫病病情可取得一定成效，但应长期坚持。
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