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【单选题】
以下叙述不正确的是( )A.
C语言中的字符常量是用一对单引号(' ')括起来的单个字符
B.
字符串常量是用一对双引号(“ “)括起来的字符序列
C.
字符型数据与整型数据之间不可以通用
D.
为了便于判断字符串是否结束,系统会自动在最后一个字符后面加上一个转义字符(‘\0’)
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举一反三
【单选题】The reasons for the popularity of Treasury bills are the following except that ______.
A.
they are the only money market instruments affordable to individual investors
B.
they are highly liquid
C.
they are risk-free
D.
they give higher return than other money market instruments
【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
【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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