衡量投资风险的大小时计算和评价程序是先看标准变异率再看期望值。（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25282' and id < 2139006 and id<>'2139006' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25282' and id > 2139006 and id<>'2139006' order by id asc limit 5