Meeting foreign language requirements for the Ph. D.
A. is the most frequent reason for dropping out.
B. is more difficult for the science candidate than for the humanities candidate.
C. is an essential part of many Ph.programs.
D. does not vary in difficulty among universities.
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After reading the article, one would refrain from concluding that
A. optimism reigns in regard to getting Ph. dropouts to return to their pursuit of the degree.
B. a Ph. dropout, by and large, does not have what it takes to learn the degree.
C. colleges and universities employ a substantial number of Ph.dropouts.
D. Ph. ‘s are not earning what they deserve in nonacademic positions.
It can be inferred that the high rate of dropouts lies in
A. salary for Ph. too low.
B. academic requirement too high.
C. salary for dropouts too high.
D. 1000 positions.
关于呼吸衰竭,下列说法错误的是
A. 肺通气功能障碍引起
B. 肺换气功能障碍引起
C. 必有PaO2降低
D. 必有PaCO2增高
E. 引起机体乏氧性缺氧
低钾血症时,病人可发生
A. 气体弥散障碍
B. 限制性通气不足
C. 阻塞性通气不足
D. 死腔样通气
E. 功能性分流
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