Engineering Materials
For a steel containing 0.8% carbon

There can be any number of critical points
There are two critical points
There is only one critical point
There is no critical point

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Engineering Materials
Aluminium bronze contains

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
10% aluminium and 90% copper
90% magnesium and 9% aluminium with some copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

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