求翻译：Generally you should follow the hierarchy of controls (starting with elimination) when selecting control measures. However, your selection may need to be influenced by the availability, perceived effectiveness and cost of the preferred control measure, particularly in regard to the perceived benefit or ‘degree of control’ offered. An expensive control measure need not be applied to a low risk hazard. Equally, a hazard of high risk should have a range of control measures applied to it, regardless of any difficulties with the expense, degree of control and availability.是什么意思？

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