正整数是自然数。[ ]
正确
The poor man , ________,ran out of the dark cave.
A.tired and frightened
B.tiring and frightened
C.tired and frightening
D.tiring and frightening
男,33岁。患者因上消化道大出血入院,经治疗病情稳定,出血停止,为明确出血原因,首选的检查是()
A.纤维胃镜检查
B.B超检查
C.肝功能化验
D.选择性腹腔动脉造影
E.钡餐透视