Replace the underlined word with the synonym .University reglations state that students must pass 18 modules to graduate .
A. suggest
B. require
C. specify
D. imply
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Replace the underlined word with the synonym .At the end of her talk , the lecturer finished with a brief review of the main points.
A. concluded
B. convert
C. contend
D. complement
肺通气的原动力是( )
A. 胸膜腔内负压
B. 肺的弹性回缩力
C. 肺本身的舒缩活动
D. 呼吸肌的舒缩活动
E. 肺内压与大气压的差值
下列哪项能使氧解离曲线发生右移( )
A. 糖酵解加强
B. 温度降低
C. PH值升高
D. CO2分压降低
E. CO中毒
关于胸膜腔内压的叙述,正确的是( )
A. 在呼吸过程中胸膜腔内压无变化
B. 有利于胸膜腔内静脉血和淋巴液的回流
C. 使胸膜腔内存有少量液体
D. 胸膜腔内压大于肺的回缩力
E. 胸膜腔内压始终高于大气压