在考虑相间过电压的作用时，考虑的空气间距为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id < 4504181 and id<>'4504181' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id > 4504181 and id<>'4504181' order by id asc limit 5