Workshop Technology
For arc welding

Alternating current with low frequency is used
Direct current is used
Alternating current with high frequency is used
Any one of these

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Workshop Technology
A progressive limit gauge has

Separate 'Go' and 'Not go' members
'Go' and 'Not go' member on the same side of the gauge
'Go' member at one end and 'Not go' member at the other end
None of the listed here

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