Workshop Technology
For arc welding

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

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Workshop Technology
A progressive limit gauge has

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

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