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In order to grade the used bits, IADC published the Three Point Dull bit Grading Scheme.
为了对已使用的钻头进行磨损定级,IADC制定了T - B - G钻头磨损三位定级方法。
youdao
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In order to grade the used bits, IADC published the Three Point Dull bit Grading Scheme.
为了对已使用的钻头进行磨损定级,IADC制定了T - B - G钻头磨损三位定级方法。
youdao