.电路如图所示，开关S由打开到闭合，电路内发生变化的是（   ）。                  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id < 4502668 and id<>'4502668' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id > 4502668 and id<>'4502668' order by id asc limit 5