男,38岁,一年来腰背疼,2月来,双下肢无力麻木,排尿不畅,便秘。体检:双下肢张力高,下肢肌力4级,反射亢进,Babinski(+),脐部以下感觉减退,最能明确诊断的辅助检查时:()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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