When hanging off drill pipe in emergency situations aboard a ship，the preferred location of the drill bit is（）.<br>A:on bottom with the full drill string in tension<br>B:one stand (approximately 93 feet) off bottom<br>C:no deeper than the shoe of the last casing set<br>D:as close to the surface as possible

When hanging off drill pipe in emergency situations aboard a ship，the preferred location of the drill bit is（）.
A:on bottom with the full drill string in tension
B:one stand (approximately 93 feet) off bottom
C:no deeper than the shoe of the last casing set
D:as close to the surface as possible

出自：海船船员证

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