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成年未失血患者临床症状表现为：意识淡漠、体温39℃、血压80/40mmHg、心率130次/分、少尿。

以下哪项检查对脱水的诊断无意义（）

A.红细胞平均容积

B.血清钠离子浓度

C.血清钾离子浓度

D.红细胞比容

E.尿比重

答案

参考答案：C

改错题

I’m good at singing. I’ve been interested in music and dreamed of become a singer ever since my childhood. My parents began to teach me children’s songs until I was only three. After I started school I had more chances to enjoy various song, such as folk songs and popular songs, and practicing singing a lot. I like singing English songs as well, which greatly benefits me in my learning of English. 

Practice makes perfectly. I have made great progress in singing and my efforts have paid for. Last year, I take part in a talent show and won prize.I think everyone is unique and has our advantages in some respects. I know my singing skills still need to be improved. But I’m confidence that I will serve our society with my songs in the future.

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单项选择题

国民经济评价按( )的原则，采用影子价格、影子汇率、社会折现率等国民经济评价参数，从国家整体角度考察项目的效益和费用，分析计算项目对国民经济的贡献，评价项目的经济合理性。

A．影子价格

B．影子汇率

C．合理配置资源

D．社会折现率
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