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,
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.5.2 -.
.5.3 : ) ; ) 5%Sb 95%Pb; ) 10% Sb 90%Pb; ) 20%Sb 80%Pb; ) 40%Sb 60%Pb;
) 80%Sb 20%Pb; )
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5. .
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6
: ̳ ( ) .
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7