【单选题】
通信设备用交流电供电时，在通信设备的电源输人端子处测量的电压允许变动范围为额定电压值的___。（易）（基础知识）
A. －5%～＋5%
B. －10%～＋5%
C. －10%～＋10%
D. －15%～＋10%
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答案
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通信电源设备及重要建筑用电设备用交流电供电时，在设备的电源输人端子处测量的电压允许变动范围为额定电压值的___。（中）（基础知识）
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1___
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2___
A. His family moved to Sacramento to settle down.
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3___
A. Tomake him feel better after he lost the first prize.
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1___
A. Superstitions and science.
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2___
A. Walking under a ladder.
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3___
A. Because black cats look like witches.
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4___
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3___
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4___
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1___
A. He broke the milk bottle.
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2___
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4___
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1___
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2___
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3___
A. Going to visit relatives.
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4___
A. Surfing in the sea.
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2___
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3___
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4___
A. Older people go out to pubs more often.
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