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Galvanized steel grating which has been cooled in air is known as “air-cooled” grating. And galvanized steel grating that has been cooled in h2o is recognized as “h2o-cooled” grating. The system at the rear of metallic squeaking is not any distinct from the squeal of skidding tires or even the squeak of the floorboard, Robert Hyers, a prof