有效汽蚀余量小，则泵运行的抗汽蚀性能就好。（    ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55256' and id < 3492492 and id<>'3492492' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55256' and id > 3492492 and id<>'3492492' order by id asc limit 5