单项选择题
A.NCP B.OSC C.OTUvq D.PCWCS
A.1/4/8/16 B.1/2/4/8 C.1/8/16/32 D.1/2/4/16
A.1511 B.1531 C.1551 D.1571
A.4 B.8 C.12 D.16
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