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【单选题】
患者男性，49岁，昨日夜间10时饮啤酒10余瓶后，骑电瓶车回家途中因剧烈颠簸突发下腹部疼痛，但可忍受。到家后，患者觉腹胀，小便排除困难，用力腹压辅助排尿约20ml，排尿末段带血。患者未予重视，睡至次日上午9时，觉腹胀难忍，以"9小时无小便"急诊就医。急诊医生予导尿试验，出量远大于入量。 该患者最可能的诊断是（）【提示】患者行膀胱造影检查，提示膀胱外火焰状造影剂扩散，但未见造影剂衬托肠袢。A.
肠梗阻
B.
腹膜内型膀胱破裂
C.
腹膜外型膀胱破裂
D.
肠痉挛
E.
阑尾炎
F.
尿道断裂
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举一反三
【单选题】Treasury bills do not _________
A.
pay interest.
B.
have a maturity date.
C.
have a face amount.
D.
have an active secondary market.
【单选题】Which of the following is a characteristic of Treasury bills?
A.
They are coupon instruments
B.
They are short-term debt instruments issued by major corporations
C.
They are discount securities
D.
They have more risk than other money market securities
E.
All the options are characteristics of Treasury bills
【简答题】设总体 ,其中 未知, ,则 的矩估计量
【单选题】The only disadvantage of investing Treasury bills is that ______.
A.
the liquidity is not satisfactory
B.
the return is not satisfactory
C.
the investment is not so safe
D.
the investment is not exempt from state taxes
【单选题】As some treasury bills do not actually pay interest, they are not attractive to investors.
A.
Right
B.
Wrong
C.
Doesn't say
【单选题】Which of the following statements are true of Treasury bills?
A.
The market for Treasury bills is extremely deep and liquid.
B.
Occasionally, investors find that earnings on T-bills do not compensate them for changes in purchasing power due to inflation.
C.
By volume, most Treasury bills are sold to individuals who submit noncompetitive bids.
D.
All of the above are true.
E.
Only (a) and (b) of the above are true.
【简答题】设总体 的分布函数为 ,其中未知参数 , 为来自总体 的样本,则 的矩估计量为( ), 的极大似然估计量为( )
【简答题】设总体 ,其中未知参数 , 是 的样本,则 的矩估计为 , 样本似然函数为 .
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