导电材料的电阻,不仅和材料有关,尺寸有关,而且还会受外界环境的影响,金属导体的电阻值,随温度升高而增大,非金属导体电阻值,却随温度的上升而减少。( )
发布时间:2026-01-24
A.正确
B.错误
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500095 and id<>'4500095' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500095 and id<>'4500095' order by id asc limit 5
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