Design of Steel Structure
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is

high strength bolt
black bolt
turned and fitted bolt
ordinary unfinished bolt

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Design of Steel Structure
The mechanism method and the statical method give

lower and upper bounds respectively on the strength of structure
lower bound on the strength of structure
upper and lower bounds respectively on the strength of structure
upper bound on the strength of structure

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