Workshop Technology
Aluminium is the best material for making patterns because it is

All of the listed here
Easy to work
Light in weight
Corrosion resistant

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Workshop Technology
In permanent mould casting method

Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure
None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition

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