It is proposed that economical performance of diamond bits be quantitatively appraised by use of bit drilling cost.

并提出用钻头钻进成本定量地评价金刚石钻头的经济效果。

youdao

It is proposed that economical performance of diamond bits be quantitatively appraised by use of bit drilling cost.

并提出用钻头钻进成本定量地评价金刚石钻头的经济效果。

youdao