<span>drilling
string, power losses, water-gas bearing layers, drag bit, surface
equipment, drill shaft, drill pipe, working conditions.
</span>
бурильная
колонна, потери мощности, водо- и газо- носные слои, <span>головка спирального сверла, наземное
оборудование, </span><span>сверлильный вал, </span><span>буровая труба, условия работы.</span>
When do they go to the country?
when does Ann meet teacher?
Where does he go in Friday?
What do the pupils can take?
Who is good boy?