求翻译：The pressure loss class is selected by the manufacturer from the values of the following R 5 of ISO 3:1973 as indicated in Table 4: for a given pressure loss class the pressure loss through the water meter, including its filter and/or straightener, where either of these forms an integral part of the water meter, shall not be greater than the specified maximum pressure loss between Q1 and Q3.是什么意思？

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