必须定期检查大钳吊绳的滑轮和平衡铊。
Rig tong line pulley and counterbalances must be inspected at regular intervals.
必须定期检查大钳悬吊绳，使其处于良好的备用状态。
Hanging lines for the rig tongs must be inspected at regular intervals and be in good working condition.
必须定期检查大钳平衡铊的吊绳。
The rig tong counter-balance line must be inspected at a regular interval.
必须定期检查大钳平衡铊的吊绳。
The rig tong counter-balance line must be inspected at a regular interval.
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