A.1540-1550 B.1545-1555 C.1555-1560 D.1555-1565
A.1535-1545 B.1540-1550 C.1545-1550 D.1550-1555
A.1540~1550℃ B.1550~1560℃ C.1560~1565℃ D.1565~1570℃