Email format error
Email cannot be empty
Email already exists
6-20 characters(letters plus numbers only)
The password is inconsistent
Email format error
Email cannot be empty
Email does not exist
6-20 characters(letters plus numbers only)
The password is inconsistent
Sound barriers are materials help to block sound and noise or create soundproof walls, ceilings, or enclosures for noisy equipment.
Octave Band Frequencies (Hz) | ||||||
Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
Sound Reduction (dB) | 16 | 18 | 22 | 26 | 35 | 47 |
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