钻柱在井下的受力极度复杂，甚至工作在腐蚀性介质中。

The pressure of the under well drill rod which even works in the caustic medium is extremely complex.

youdao

钻柱在井下的受力极度复杂，甚至工作在腐蚀性介质中。

The pressure of the under well drill rod which even works in the caustic medium is extremely complex.

youdao