A hydraulic service jack (floor jack) has the advantage of no loose chain to get in the way.
卧式液压千斤顶的优点在于没有松垮链条的牵绊。
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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