绕线型感应电动机转子回路串电阻调速在空载或轻载时的调速范围很大（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id < 4488258 and id<>'4488258' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id > 4488258 and id<>'4488258' order by id asc limit 5