A.In 1585.
B.In 1584.
C.In 1583.
D.In 1586.
A.In 1636.B.In 1638.C.In 1836.D.In 1782.
A.In 1987B.In 1986C.In 1985D.In 1984
A.In 1928.B.In 1982.C.In 1980.D.In 1920.
A.In 1980.B.In 1986.C.In 1991.D.In 2000.
A.In 1585.B.In 1584.C.In 1583.D.In 1586.
【C6】A.In factB.In additionC.In generalD.In theory