Tafuta ' ' kupata maudhui yanayofaa , ambayo inachukua sekunde }
Neno halijajumuishwa kwenye tovuti hii 'Epe304', unakaribishwa kuunda :)
Muhtasari:According to the purpose it can be divided into oil well pipe (casing, oil pipe and drill pipe), pipeline pipe, boiler p[Soma maandishi yote]