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三相异步电动机的降压起动有三种方法，分别是定子串联电阻或电抗降压起动、自耦变压器降压起动和（ ）起动
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举一反三
【单选题】38 Piles of dung can’t be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter an over the region．
C.
they are different in decay rate．
D.
they are different in quality．
【单选题】Piles of dung can't be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter all over the region
C.
they are different in decay rate
D.
they are different in quality
【单选题】Piles of dung can't be relied upon when it comes to estimating elephant numbers because______.
A.
they are different in size.
B.
they scatter all over the region.
C.
they are different in the rate of decay.
D.
they are different in quality.
【单选题】When estimating population parameters, a point estimate is:
A.
a range of possible values for a population parameter.
B.
always equal to a population value.
C.
a statistic that estimates a population parameter.
D.
the population mean.
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