单项选择题
A.前中 B.前中减1/8 C.前中减3/16 D.前中减1/4
A.1 B.11/2 C.13/4 D.2
A.5/16 B.1/4 C.3/16 D.1/8
A.5/8 B.1/2 C.3/8 D.5/16
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