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Which of the following combination is used for metal welding? i. Oxygen and Ethyne ...

Which of the following combination is used for metal welding?
i. Oxygen and Ethyne
ii. Hydrogen and Ethyne
iii. Hydrogen and Oxygen
iv. Ethyne, Hydrogen and Oxygen

A. i and ii
B. iii and iv
C. i and iii
D. ii and iv




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