女性，18岁。低热、腹痛、腹泻伴腹胀2个月。查体:腹壁揉面感，腹部移动性浊音 阳性。腹水为渗出液。为明确诊断，最有 价值的检查是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31929' and id < 2553218 and id<>'2553218' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31929' and id > 2553218 and id<>'2553218' order by id asc limit 5