单项选择题
A.东西 B.左右 C.南北 D.前后
A.1/3000 B.1/3800 C.1/3900 D.1/4000
A.1/3000 B.1/3200 C.1/3300 D.1/3100
A.1/4300 B.1/4200 C.1/4100 D.1/4000
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