A.+50,0
B.+50,-50
C.+100,0
D.+100,-50
A.25, 10, 10, 30
B.25, 15,5,30
C.20, 10,5,30
D.20, 15, 10, 30
A.4m
B.9m
C.10m
D.11m
A.一
B.二
C.三
D.四
A.0.2m
B.0.5m
C.0.8m
D.1.2m
A.50
B.75
C.100
D.125