Hard hats shall not be modified in any way, such as drilling and shall be regular inspected for visible cracks, defects and expiration date.

安全帽不能以任何方式进行修改，如钻孔并且进行定期检查以确定是否有明显的裂纹，缺陷和有效期。

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Hard hats shall not be modified in any way, such as drilling and shall be regular inspected for visible cracks, defects and expiration date.

安全帽不能以任何方式进行修改，如钻孔并且进行定期检查以确定是否有明显的裂纹，缺陷和有效期。

youdao