EJ$02$

$1.$ A $-$ B $$ A $1000,$ B $1200..$ A $$ B $$ A $$ B $.$ eutectic $$ eutectic $$ Xp $=0\mathrm{.}4$ eutectic $800.()1400$ K$1100$ K$900$ K $700$ K $1400$ K$1100$ K$900$ K $700$ K $()()$ eutectic $?324()$ A $$ B $$ eutectic $$ A $0\mathrm{.}4?()$A $$