A . A、E-75优质钻杆,抗拉强度=141,000kg(311,200lbs)B . B、任何一种钻杆均可.C . C、S—135优质钻杆,抗拉强度=254,000kg(560,100lbs)D . D、G—105优质钻杆,抗拉强度=198,000kg(436,150lbs)E . E、X—95优质钻杆,抗拉强度=179,000kg(394,200lbs).
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