A.2700-3000℃ B.3000-3250℃ C.3000-3100℃ D.3100-3300℃
A.0.01-0.1 B.0.5-1.0 C.0.1-0.2 D.1-2
A.2.2-81% B.2.8-93% C.3.1-92% D.4.1-92%