单项选择题
A.1/65 B.1/32 C.1/56 D.1/48
A.37 B.95 C.100 D.127
A.1030507020406 B.1030502040608 C.10305072040608 D.103050702040608
A.1/16 B.5/64 C.1/8 D.1/4
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