单项选择题
A.100mm B.50mm C.150mm D.200mm
A.走线架悬挂安装 B.挂墙安装 C.机柜顶摆放 D.A&B
A.1000W B.1200W C.1600W D.2100W
A.-48VDC B.+48VDC C.220VAC D.380VAC
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