Design of Steel Structure
The ratio of plastic section modulus to elastic section modulus

is always greater than 1
is always less than 1
can be less than 1
is equal to 1

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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
upper bound on the strength of structure
lower bound on the strength of structure

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