正确的填“√”,错误的填“× ”
A.1
B.2
C.3
D.4
A.10
B.20
C.30
D.60
A.40
B.60
C.80
D.90
A.0. 6
B.0.2
C.1
D.0.8
A.5
B.10
C.15
D.20
A.1
B.3
C.5
D.10
A.10
B.15
C.20
D.30
A.10
B.50
C.60
D.100
A.5
B.10
C.15
D.20
A.20
B.16
C.12
D.10
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