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男性，32岁，突发寒战，发热，腰痛1天，晨起尿呈酱油色，头晕，检查：血红蛋白56g/L，红细胞1.4×10/L，白细胞3.2×10/L，血小板68×10/L。

此病人住院期间查肝功能正常，血总胆红素205.5μmol/L，间接胆红素184.7μmol/L，为确诊应做哪项检查（）

A.血Coombs试验

B.血Ham试验

C.红细胞渗透脆性试验

D.血清铁蛋白定量

E.血红蛋白电泳

答案

参考答案：B

单项选择题

Joshua Douglas, CFA, is interested in the relationship between the stock prices of two companies, Sonata Inc. and Prius Inc. After downloading a time series of stock prices for each company, Douglas concludes that Sonata Inc. has a variance equal to 25.0 percent and Prius has a variance equal to 20.0 percent. If the covariance between the two stocks is -0.10, the correlation coefficient is:（）

A. negative, and indicates that a 1.0% increase in the price of Sonata would be accompanied by a 2.0% decrease in the price of Prius.

B. negative, and indicates that a 10.0% increase in the price of Sonata would be accompanied by a 4.5% decrease in the price of Prius.

C. positive, and indicates that a 1.0% increase in the price of Sonata would be accompanied by a 2.0% increase in the price of Prius.
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单项选择题

下面关于苹果开花习性的描述，不正确的是（）

A.花芽为混合花芽

B.苹果是异花授粉的果树

C.以腋花芽结果为主

D.一朵花序中，中间花先开
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