单项选择题
A.64MB B.128MB C.256MB D.不限
A.73V±3V B.73V±5V C.83V±3V D.83V±5V
A.120V±2V B.120V±5V C.135V±2V D.135V±5V
A.30h B.50h C.70h D.90h
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