企业要适应不断变化的外部环境，就必须不断地调整企业的业务与产品，即在企业的经营目标、

碳化钙气压法作土的含水率时应特别注意______。

A．碳化钙的纯度、测定仪型号及含水量测定范围

B．仪器关闭前试样和碳化钙不能混合

C．土的分类

D．称干土重

原刺激机体产生抗体或致敏淋巴细胞的特性称为（）

A.免疫原性

B.反应原性

C.抗原性

D.异原性

E.特异性

杜慎卿是《（）》中的人物，傻大姐是《（）》中的人物。

慢性肾炎引起高血压肾功能不全与高血压病引起肾功能不全的最重要的鉴别资料是（）

A.血压增高程度

B.肾功能损害程度

C.眼底改变

D.高血压与肾炎的发病史

E.心功能改变

Time, Newsweek, and U. S. News ＆ World Report are popular newsmagazines. The present national and international news, stories of human interest, and reports on new books, movies, plays, sports events, fashions, foods and so on are included. The articles are written in an informal style, and they are illustrated with photographs. More than nine million people read newsmagazines regularly. Two picture magazines Life and Look enjoyed popularity for many years. They presented the news with simple texts and many photographs, and they remained among the most widely read magazines until the late 1960s. Some people think these picture magazines were forced out of business because they could not compete successfully with the live pictures on televised news programs. Today there are approximately I 750 daily newspapers, with a total circulation of over 62 million and more than 580 Sunday papers, with a circulation of almost 60 million.