试题与答案

在水平孔钻进中.起下钻具必须单根拧卸,不准()根以上同时卸,A、3 B、2 C、1

题型:单项选择题

题目:

在水平孔钻进中.起下钻具必须单根拧卸,不准()根以上同时卸,

A、3

B、2

C、1

答案:

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参考答案:臻于至善

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