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.
必须定期检查大钳吊绳的滑轮和平衡铊。
Rig tong line pulley and counterbalances must be inspected at regular intervals.
工具、护丝和钻头等，都不能用来增加大钳平衡铊的重量。
Makeshift weights such as tools, pipe protectors, bits, etc. should not be added to the counterbalance weights.
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