This paper introduces hydraulic vibration-exciting system for marble moulding machine, and pats forward rational selection method of vibration. parameter for the system controlled by rotary valve.

本文介绍了应用于再造大理石成型机的液压激振系统，并提出了应用转间控制的系统其振动参数的合理选择方法。

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By theoretical analysis, it defines a new concept-system critical filtration efficiency and puts forward a calculation and selection method of air filters.

通过理论分析，本文首次提出系统临界过滤效率的概念，并从中得出舒适性空调系统空气过滤器的计算和选择方法供参考。

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The monitoring method and evaluation indicators of environmental evaluation factors are put forward, and it provides the reference for the site selection, environmental evaluation and certification.

给出了环境评价因子的监测方法和评价指标，对无公害蔬菜种植生产基地的选址、环境评价、认证提供了参考。

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But the larger question is: has the mediocre quality of the candidates, the public boredom with their debates and the unexciting, not to say confusing, method of selection set the Conservatives back rather than forward on the road to recovery?

ECONOMIST: Canada