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【单选题】
罹患率A.
是一定时期内（一年内）某特定人群中新发病例出现的频率
B.
是某特定人群在小范围、短时间内的新发病例的频率
C.
是一定时间，特定人群中某病新旧病例数所占比例
D.
用于描述病程较长的慢性病的发生或流行情况
E.
又称现患率
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反馈参考答案：
举一反三
【单选题】Our school is ______ than theirs. [ ]
A.
much beautiful
B.
much more beautiful
C.
more much beautiful
D.
a little beautiful
【简答题】货物描述是否有错?如有,请修改。
【单选题】Which is the independent variablesthat tracked by Earned Value Analysis? ( )
A.
Net Present Value
B.
Value of work planned
C.
Discounted Cash Flow
D.
A nnual cash flow
【单选题】Which of the following statements is false ?（ )
A.
Payback period is the time in which the initial cash outflow of an investment is expected to be recovered from the cash inflows generated by the investment.
B.
Payback period u sually expressed in years or months.
C.
A nnual cash flow is variable.
D.
Payback Period = Initial Cost / Annual cash inflow
【单选题】When ( ) equals zero, the discount rate is the internal rate of return.
A.
Discounted Cash Flow
B.
A nnual cash flow
C.
Payback period
D.
Net Present Value
【简答题】Salk疫苗(IPV)
【单选题】The Discounted Cash Flow (DCF) techniques include ( )
A.
Net Present Value
B.
Payback period
C.
Internal Rate of Return
D.
A nnual cash flow
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