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问题 单项选择题

自体骨髓移植不会出现下列哪种情况（）

A.免疫抑制

B.移植失败

C.排斥反应

D.白质脑病

E.出血性膀胱炎

答案

参考答案：C

解答题
计算：
3
cos30°+
2
sin45°+6tan230°
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单项选择题

An analyst does research about money-weighted rate of return and time-weighted rate of return. On 30 June 2010, an investor opened an account with $1000000. The account experienced the following activity over the next two years:

Date Withdrawals Net Ending Balance
30 June 2011 $471000 $451000
30 June 2012 — $499900
As of 30 June 2012, the investor's money-weighted rate of return and timeweighted rate of return:（）

A. are both positive.

B. are both negative.

C. have different signs.
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