In FCAW, atmospheric shielding is ____.
A. provided solely by flux sealed within the tubular electrode
B. provided completely through a nozzle in the same way as GMAW
C. not necessary
D. provided by flux sealed within the tubular electrode, but extra shielding may be supplied through a nozzle as in GMAW
Answer: D
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The usual basis for association of plants into families is ________ characteristics
A) flower B) leaf C) root D) stem
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What will be an ideal response?
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