单项选择题
A.4-6cmB.10-20cmC.8-10cmD.20-30cm
A.6枚B.5枚C.4枚D.7枚
A.1.5B/10B.2B/10C.B/10D.B/20
A.N/5B.N/6C.B/10D.B/6
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