患者，男，22岁。因呕吐咖啡色液体及黑便来诊。既往无胃病及肝病史。查体:面色稍苍白，血压100／60mmHg，心率92次／分，腹软，肝脾未触及，肠鸣音活跃。成人出现大便隐血阳性时，消化道出血量至少大于

A role is best defined in its relation to______.

A．another status

B．its obligation

C．other roles

D．its importance

"Illiterates", according to Hillerich, are best defined as people who ______.

A．cannot read or write at all

B．only have a primary education

C．read and write inadequately for their needs

D．have no education of any kind at all

Decentralization is best defined as ______.

A．movement from the central city to rural areas

B．movement from the central city to the suburbs

C．disorderly expansion of the central city

D．shrinking of metropolitan

The authors attitude towards the technique of training mans body can best be defined as

A．ambiguous

B．skeptical

C．contemptuous

D．positive

A．Y

B．N

C．NG

Decentralization is best defined as ______.

A．movement from the central city to nu'al areas

B．movement from the central city to the suburbs

C．disorderly expansion of the central city

D．shrinking of metropolitan