safety-related system 安全相关系统 safety-related component 安全相关设备 Security and strength of safety-related fasteners 安全紧固件强度测试 ..
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Subgrade as a major component of the road, its quality and the severity of disease related to traffic safety.
路基作为公路的主要组成部分,其质量的好坏,病害的严重程度关系到行车的安全。
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