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【单选题】
如果一项投入品的边际产量为正,但随着投入增多,边际产量递减,则( )A.
平均产量一定下降;
B.
总产量不断增加,但增加的速度越来越慢;
C.
厂商应当减少产出;
D.
总产量已达到最高点,正在不断下降
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举一反三
【简答题】A．The language they are written in is not widely known. B．They cannot be moved from where they were found C．The writing in them has faded D．Many people want credit for the discovery.
【简答题】Yd联结的三相变压器，一次绕组加额定电压空载运行，将二次绕组的闭合三角形打开，用电压表测量开口处电压；再将三角形闭合，用电流表测量回路电流。问在三相变压器组和三相心式变压器中，各次测得的电压、电流有何不同?为什么?
【单选题】Tony, tell me the result of the discussion ______ you had with your dad yesterday.
A.
what
B.
which
C.
when
D.
who
【单选题】I cannot tell the ______ difference between the twins.
A.
slender
B.
single
C.
simple
D.
slight
【单选题】We cannot tell whether in general trade surplus is good or bad because:
A.
Economists do not agree on this issue.
B.
Trade is always balanced.
C.
It depends on economic environment in each country.
D.
We do not have enough evidence from the available data.
【简答题】变压器二次绕组开路、一次绕组加额定电压时,虽然一次绕组电阻很小,但一次电流并不大,为什么? Z m 代表什么物理意义?电力变压器不用铁心而用空气心行不行?
【单选题】Babies are not born with __ moral sense; they cannot tell __ difference between right and wrong.
A.
a 不填
B.
不填；a
C.
a; the
D.
the; the
相关题目：
【单选题】I cannot tell the ______ difference between the twins.
A.
slender
B.
single
C.
simple
D.
slight
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