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

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

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

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

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