How noisy is the air cannon on the construction site?

The noise of the wind cannon at the construction site is as high as 85 decibels within 10 meter and as high as 75 decibels within the distance of 40-50 meters. It can be said that the noise is quite loud. The air cannon is brought by the air compressor, which is more powerful than the electric pick by using air pressure, and is suitable for crushing high-strength or large pieces of concrete.

Efficacy and function of stewed radish with ribs

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Which is better, the encyclopedia of cultivating immortals?

Several different styles of tea sets, I like black pottery.

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