450
0
20
1471
0
20
1026
1
20
929
0
19
700
4
19
1097
0
19
773
4
19
267
0
19
1160
0
19
1095
0
19
938
0
19
542
0
19
1091
0
19
2532
0
19
633
0
19
1523
0
19
1231
0
19
639
0
19
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Keyword(s): 数学A