需要某晶闸管实际承担的某波形电流有效值为 300A，则可选取额定电流为(    )A 的晶闸管。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495185 and id<>'4495185' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495185 and id<>'4495185' order by id asc limit 5