The results can quantitatively provide any acoustic problem of the analyzed helmets. It is reason-able to establish a standard for objective m…
其结果表明，不同设计的头盔的回声与隔声性能，确实有很大差别。
The results can quantitatively provide any acoustic problem of the analyzed helmets. It is reason-able to establish a standard for objective m…
其结果表明，不同设计的头盔的回声与隔声性能，确实有很大差别。
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