单项选择题
A.9个 B.10个 C.12个 D.15个
A.02,12,17,20 B.02,08,12,16 C.02,08,14,20 D.02,12,18,24
A.02,04,07,12,14,16,18,20 B.02,05,08,11,14,17,20,23 C.01,04,07,09,12,14,16,20 D.02,06,08,12,14,18,20,24
A.4个 B.5个 C.8个 D.10个
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