FJ$11$

$1()1.30$ wt$\%$ Pb $70$ wt$\%$ Sn $25027.()($i$)$ alloy hypoeutectic $$ hypereutectic? $($ii$)?($iii$)183$ C $+$AT $?($iv$)1830-$ AT $??($v$)?(\%$ Sn$)601000204080327$C $600300500232$C $2001831004060($wt$\%$ Sn$)($Pb$)($Sn$)$ Q$2($a$)$ Plumbum$-$Stanum $$