One floor man should stand close to the spool to inform the driller with a two-way radio when there is no loose drilling line coming off the spool.
让一个钻工站在大绳储备筒旁边，用对讲机把大绳的松紧情况通知司钻。
One floor man should stand close to the spool to inform the driller with a two-way radio when there is no loose drilling line coming off the spool.
让一个钻工站在大绳储备筒旁边，用对讲机把大绳的松紧情况通知司钻。
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