2019N @@@12@@@
y
 1
@

S
 2

S
 3
@
S
 4
@

 5
xf
 6
@

S
 7
@

S
 8

S
 9
@

10
@

11
@
S
12
xf
13
@

S
14
@

S
15

S
16
@
S
17
@

S
18
@

19
xf
20
@
S
21
@

S
22
@

23 Vca
@

24

S
25
@
S
26
xf
27
@

S
28
@

S
29
@

S
30
@

S
31
xf
[Ǘ]