本例经积极治疗后症状加重逐渐出现意识障碍，气道分泌物多且不易排出PCO287mmHg应采取
A. 激素
B. 利尿剂
C. 气管插管机械通气
D. 面罩机械通气
E. 增加呼吸兴奋剂流量
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Opportunity cost is______.
A. a cost that cannot be avoided, regardless of what is done in the future
B. the cost of doing something as measured in terms of the value of the lost opportunity to pursue the best alternative activity with the same time and resources
C. the additional cost of producing an additional unit of output
D. the additional cost of buying an additional unit of a product
女性，56岁，发热2周，应用消炎痛栓可退热，停用后复发。尿量200ml/24h，BUN27mmol/L，Cr561μmol/L。肾活检病理示：20个肾小球，2个纤维性新月体，肾间质嗜酸性粒细胞浸润
信号传递理论认为,在信息对称的情况下,公司可以通过股利政策向市场传递有关公司未来盈利能力的信息。()
A. 正确
B. 错误
集装箱箱主代码第3位字母为U。()
A. 正确
B. 错误
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