长期以来，射孔被认为是钻井工程的最后一道简单工序。

For a long time, perforation is Just regarded as the last simple process in drilling.

youdao

长期以来，射孔被认为是钻井工程的最后一道简单工序。

For a long time, perforation is Just regarded as the last simple process in drilling.

youdao