单项选择题
A.1/4~2/3 B.1/4~3/4 C.1/4~1/3 D.1/3~1/2
A.1388 B.2159 C.3000 D.1450
A.150 B.200 C.250 D.300
A.20 B.40 C.60 D.80
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