t1

t2

dt

Δ

新t1

128.5

0.0

−128.5

−79.4

49.1

49.1

2.0

−47.1

−29.1

20.0

20.0

18.3

−1.7

−1.0

18.9

18.9

20.9

2.0

1.2

20.2

19.5

19.4

−0.1