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1. Flatness inspection Place a steel flat ruler with a straightness tolerance of 0.1mm on the two diagonal lines of the inspected surface naturally, and ...

It is measured with a 90 degree steel square with an internal angle perpendicularity tolerance of 0.13mm and an internal angle side length of 500mmx400mm. ...

1. Steps Use a vernier caliper to measure the height of the steps, and measure the maximum value as the height of the steps. 2. ...

1. With pattern and color tone, put the qualified board and the tested board flat on the ground, standing at a distance of 1.5m from ...

The scientific name of slate bluestone is limestone. It is the most widely distributed rock among sedimentary rocks. It is produced all over the country. ...

Are Granite Tiles Good For Bathroom Floor and Wall Paving in Daily Life? Natural granite tiles are attractive, durable and versatile, and come in many ...