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问题详情

A device used to enlarge the size of an existing bore hole，having teeth arranged on its outside circumference to cut the formation as it rotates is a（n）（）.

A、Enlarger bit

B、Casing bit

C、Hole opener

D、Casing opener

时间：2022-01-11 05:30 关键词：船舶物料及管理

答案解析

C

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