Some properties of aluminium are listed.
1 It has mechanical strength.
2 It conducts heat.
3 It is resistant to corrosion.
4 It has a low density.
Which properties make aluminium useful for making the bodies of aircraft?
1 )
1, 2 and 3
2 )
1, 2 and 4
1, 3 and 4
4 )
2, 3 and 4
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