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【单选题】
下列等式中错误的是( )。A.
exdx=d(e x )
B.
-sinxdx=d(cosx)
C.
D.
lnxdx=d(1/x)
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举一反三
【单选题】——I wonder if I could use your mobile phone. ——No problem. .
A.
Good idea
B.
You’ve got it
C.
It’s your turn
D.
Go ahead
【简答题】什么叫互换性?
【简答题】可靠性(reliability)
【单选题】Research has to focus on the cost benefit of factors such as reliability because ______.
A.
as reliability increases, manufacturing final cost may increase
B.
as reliability increases, manufacturing costs and the final cost will decrease
C.
as reliability decreases, manufacturing costs and the final cost will decrease
D.
as reliability increases, manufacturing costs and the final cost may increase
【单选题】Which one is true about reliability and validity?
A.
Validity is pertinent only to a particular instrument and it is an ideal state that you as a researcher to achieve.
B.
Construct validity is a less sophisticated technique for establishing the validity of an instrument.
C.
Reliability is the degree of feasibility or precision in the measurement made by a research instrument.
D.
Rationale equivalence method are not belonged to the method of reliability.
【简答题】什么叫互换性?
【简答题】Explain the qualities of reliability.
【简答题】什么叫互换性?
【简答题】A．sociability B．honesty C．stability D．reliability
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