单项选择题
A.2 B.3 C.4 D.5
A.20 B.30 C.40 D.50
A.2.5寸，4TB B.2.5寸，6TB C.3.5寸，4TB D.3.5寸，6TB
A.BNC B.VGA C.HDMI D.VGA&HDMI
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