比率制动系数是指起动元件和制动元件的比值。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69394' and id < 4492176 and id<>'4492176' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69394' and id > 4492176 and id<>'4492176' order by id asc limit 5