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【多选题】
准确度、精密度、系统误差、偶然误差的关系是()A.
准确度高、精密度一定高
B.
准确度高,系统误差、偶然误差一定小
C.
精密度高,系统误差、偶然误差一定小
D.
系统误差小,准确度一般较高
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举一反三
【单选题】21 By which means is a contractor able to control cost overruns due to changing requirements?
A.
Project data review
B.
Change order
C.
Purchase order amendment
D.
Change control
E.
None of the above
【单选题】The companies are working together to create they hope will be the best means of transport in the 21 st century.
A.
which
B.
that
C.
what
D.
who
【简答题】求下列函数的偏导数
【单选题】"Stay the course" in Paragraph 21 means ______.
A.
Keep moving
B.
Not give up
C.
Not change the way
D.
Remain the current condition
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