选出三种产品:精煤、矸石和中煤的跳汰机是主选跳汰机
参考答案:错
The book mainly deals with the trouble teens might have _____ right from wrong. [ ]
A. distinguishing
B. distinguished
C. to distinguish
D. to be distinguished
男性,38岁,突然腹痛、腹胀、停止排便排气,伴有呕吐,呕吐物为血性液体,可能的诊断为( )。
A.急性阑尾炎B.胆道蛔虫症C.输尿管结石D.绞窄性肠梗阻E.单纯性机械性肠梗阻