A system usually adopted in the production of pre-tensioned members like railway sleepers, poles, etc. on large scale is ______.

A system usually adopted in the production of pre-tensioned members li

1.	A system usually adopted in the production of pre-tensioned members like railway sleepers, poles, etc. on large scale is ______.
A.	Magnel - Blato system
B.	P. S. C. Monowire system
C.	Hoyer system
D.	Gifford-Udall system
Answer» D. Gifford-Udall system

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