In contrast to the earlier linguists, modem linguists tend to ______ .
A. attempt to continue the standardization of the language
B. evaluate language practices in terms of current speech rather than standards or proper patterns
C. be more concerned about the improvement of the language than its analysis or history
D. be more aware of the roles of the language usage
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The middle class mainly refers to people ______ .
A. who were born as aristocrat
B. who have the right to sit in the House of Lords
C. who speak in many different local accents
D. who are prosperous businessmen or professionals
In cold climates, the wood-frame dwelling, properly built and insulated, ______ warmest type of home.
A. and the
B. the
C. is the
D. where it is the
三相电源绕组△联结时只能输出( )。
A. 相电压
B. 线电压和相电压
C. 线电压
D. 相线对地电压
女性患者,72岁,冠心病患者,1周前出现呼吸困难。查体:口唇发绀,双肺底可闻及湿啰音,肝大,双下肢水肿,该患者发绀属于
A. 肺性发绀
B. 心性混合性发绀
C. 淤血性周围性发绀
D. 缺血性周围性发绀
E. 混合性发绀