黄河水资源的短缺已成为全流域国民经济和社会可持续发展的制约因素。为了缓解水资源供需矛

病人周某，左上肢因输液后有条索状红线，红、肿、热、痛，体温40．2℃，下列措施哪项错误（）。

A.抬高左上肢

B.多活动左上肢

C.局部50％硫酸镁行热湿敷

D.超短波理疗

E.使用抗生素

动脉血氧分压低于多少生命即难以维持（）

A.10mmHg

B.20mmHg

C.30mmHg

D.40mmHg

E.50mmHg

Dance critic from Europe: The improved quality of ballet in the United States is the result of more Europeans’ teaching ballet in the United States than ever before. I know the proportion of teachers who were born and trained in Europe has gone up among ballet teachers in the United States, because last year, on my trip to New York, more of the ballet teachers I met were from Europe—born and trained there—than ever before.
Which of the following identifies a questionable assumption made by the dance critic’s reasoning

A．The argument overlooks the possibility that some ballet teachers in the United States could have been born in Europe but trained in the United States.

B．The argument assumes that the ballet teachers whom the critic met last year on the critic’s trip to New York were a generally typical group of such teachers.

C．The argument assumes that the teaching of ballet in the United States is superior to the teaching of ballet in Europe.

D．Other possible reasons for the improved mental attitudes of United States dancers are not examined.

E．(E) The argument assumes that dancers born and trained in Europe are typically more talented than dancers born and trained in the United States.

《铁路技术管理规程》规定，用于侧向通过列车，速度80km/h以上至140km/h的单开道岔，不得小于（）。

A.38号

B.30号

C.18号

D.12号

乔灌木配置的基本形式主要有（）和自然式配置。