单项选择题
A.6级 B.8级 C.10级 D.12级
A.27dB B.29.2dB C.30dB D.36dB
A.-36VDC—-57VDC B.42VDV—58VDC C.180VAC—240VAC D.-45VDC—-60VDC
A.-48VDC B.220VAC C.RPS供电 D.TBBP530机柜供电
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