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【单选题】
当汽轮机危急保安器保护动作或手动停机时,可通过( )使自动停机危急遮断A.
OPC阀;
B.
ATS阀;
C.
隔膜阀;
D.
空气引导阀。
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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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