被测电压真值为100%，用电压表测试时，指示值为80V，则其相对误差为()。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32637' and id < 2595140 and id<>'2595140' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32637' and id > 2595140 and id<>'2595140' order by id asc limit 5