单选题A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.Aheavy-walled drill pipeBtool jointCdown hole toolDdrill collar
单选题
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
A
heavy-walled drill pipe
B
tool joint
C
down hole tool
D
drill collar
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