Methods The level and quality of network laboratories were evaluated through questionnaire and on-site investigation according to "guideline for influenza surveillance of Guangdong".

方法通过问卷和现场调查的方法，根据《广东省流感监测规范》对当地实验室的监测质量和水平进行全面评价。

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As of yet, there is no guideline on recommended exposure level.

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But like the emission level set earlier, this is just a guideline -- a number to indicate when swift action may be required.

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The second guideline is that the greater the number of points that can be used to identify an important support or resistance level, the more likely it is that prices will respect that level.

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