Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.是什么意思_Do not make up or break out the bit on a single joint of DC. If this is absolutely necessary, always snub drill collar with the air tugger.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句