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Which pair is incorrectly matched? (1)Cu...

Which pair is incorrectly matched? (1)Cu-Be alloys - High strength springs (2) Metallic Be - Windows of X-ray tubes (3) Magnalium - Aircraft construction (4) Milk of Magnesla - Tooth paste

A

Cu-Be alloys `" "`- High strength springs

B

Metallic Be `" "`- Windows of X-ray tubes

C

Magnalium `" "`- Aircraft construction

D

Milk of Magnesla - Tooth paste

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