下列对《建设工程施工合同（示范文本）》条件下的工程变更的论述正确的是（）A、设计变更

引起菌群失调症的原因是

A．正常菌群的遗传特性改变

B．正常菌群的耐药性明显改变

C．正常菌群的增殖方式改变

D．正常菌群的组成和数量改变

E．大量使用生态制剂

______是呼吸系统的主要器官，肺完成气体交换的场所是______．

(A)

Arthur Miller (1915-2005) is universally recognized as one of the greatest dramatists of the 20th century. Miller’s father had moved to the USA from Austria-Hungary, drawn like so many other by the "Great American Dream." However, he experienced severe financial hardship when his family business was ruined in the Great Depression of the early 1930s.

Miller’s most famous play, Death of a Salesman, is a powerful attack on the American system with its aggressive way of doing business and its insistence on money and social status as indicators of worth. In Willy Lowman, the hero of the play, we see a man who has got into double with his worth. Willy is "burnt out" and in the cruel world of business there is no room for sentiment: if he can’t do the work, then he is no good to-his employer, the Wagner Company, and he must go. Willy is painfully aware of this, and at loss as to what to do with his lack of success. He refuses to face the fact that he has failed and kills himself in the end.

When it was first staged in 1949, the play was greeted with enthusiastic reviews, and it won the Tony Award for Best Play, the New York Drama Critics’ Circle Award, and the Pulitzer Prize for Drama. It was the first play to win all three of these major awards.

Miller died of hear failure at his home in Roxbury, Connecticut, on the evening of February 10, 2005, the 56th anniversary of the first performance of Death of a Salesman on Broadway.

After it was first staged, Death of a Salesman（）

A. achieved huge success

B. won the first Tony Award

C. was warmly welcomed by salesmen

D. was severely attacked by dramatists

一患者颌面外伤，经检查出现了脑脊液耳漏

对该患者的处理，哪一项是错误的（）.

A.姿势引流

B.防止咳嗽和喷嚏

C.耳鼻应经常消毒，保持干净

D.用磺胺嘧啶或氯霉素预防感染

E.用消毒棉球填塞外耳道

混合阀前后压力表压力（）

A.一样大

B.阀前大于阀后

C.阀后大于阀前