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Available Expansion (Environmental Glossary)

Available Expansion: The vertical distance from the sand surface to the underside of a trough in a sand filter. This distance is also called Freeboard.

_ ស្វែងរកឬបកប្រែពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖
ឯកសារការងារនិងរៀនគ្រប់ប្រភេទ៖​
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