According to the passage, iron was NOT used for beams, columns, and girders prior to the early eighteenth century because _______.
A.all available iron was needed for other purposes
B. limited mining capability made iron too expensive
C.iron was considered too valuable for use in public buildings
D.the use of charcoal for refining ore produced poor quality iron
A.all available iron was needed for other purposes
B. limited mining capability made iron too expensive
C.iron was considered too valuable for use in public buildings
D.the use of charcoal for refining ore produced poor quality iron
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Hóa Học lớp 12
