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【单选题】
SVP40A协转转换器L/A亮绿灯的含义是（）
A.
以太网接口有连接
B.
以太网接口无连接
C.
运行灯
D.
系统出现告警
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【单选题】Thefollowing sentences are from one paragraph. Decide which one is the topic sentence of the paragraph?1)In time, this melted part rises as a magma.2)The formation of a volcanic eruption is a dramatic...
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mm
B.
cm
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m
D.
km
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【单选题】进位标志Cy在( )中
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B.
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