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【判断题】
光滑曲线【图片】在其驻点附近的曲率近似等于驻点处的导数的绝对值【图片】．A.
正确
B.
错误
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【简答题】一低压照明系统，系统电源电压及电流瞬时值表达式分别为 (314t+30°)V， (314t-30°)A，问： (1)系统cosα为多大? (2)系统的有功功率户、无功功率Q、视在功率S各为多大? (3)负载的性质? (4)若要提高功率因数到0.95，需要多大Qc?
【单选题】How can we finish the work in the( )of any other helpers?
A.
era
B.
haste
C.
spare
D.
absence
【单选题】–How soon can you finish the work? --We can finish it in 20 minutes if we have one more person ________ us.
A.
to help
B.
helps
C.
helped
D.
helping
【简答题】毕业设计论文环节的整个过程包括:选题、布置任务书、实习、文献查阅、开题、 、 和 。
【单选题】— How can we finish the task in such a short time? — Don't be worried. There ______ willing helpers. [ ]
A.
were not lack of
B.
are no short of
C.
was no short of
D.
is no lack of
【单选题】It remains a question_______we can finish the project in such a short time.
A.
what
B.
that
C.
how
D.
when
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