The bolts at bent links of safety chain should be secured by double nuts.
使用在弯曲连接器的安全螺栓必须用双螺帽固定住。
Both sides of the mobile deck are respectively provided with safety armrests, and a safety chain is arranged between the safety armrests.
移动甲板的两侧分别设有安全扶手，安全扶手之间设有安全链。
Both sides of the mobile deck are respectively provided with safety armrests, and a safety chain is arranged between the safety armrests.
移动甲板的两侧分别设有安全扶手，安全扶手之间设有安全链。
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