落领不齐。
落领弯曲。
When picking up or setting down drill collar stands larger than 6 1/4" on the floor board, always snub with the air tugger."
当在钻杆盒上提起或放置直径大于6 1／4〞的钻铤立柱时，一定要用气动绞车拉住以保安全。
It comprises setting-ball carrier, latch collar and baffle.
由送球器、锁紧座、挡板组成。
It comprises setting-ball carrier, latch collar and baffle.
由送球器、锁紧座、挡板组成。
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