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【单选题】
若劳动与资本的投入组合处于投入产出生产函数等产量线 的垂直部分,则( )。A.
、劳动与资本的边际产量都是负
B.
．劳动与资本的边际产量都是0
C.
、劳动的边际产量为0，资本的边际产量为正
D.
．劳动的边际产量为正，资本的边际产量为0
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反馈参考答案：
举一反三
【单选题】The pen I am writing my letter with is different from______.
A.
that one
B.
one
C.
the one
D.
the ones
【单选题】I can’t find the pen I was given. Have you seen _____? [ ]
A.
it
B.
one
C.
this
D.
that
【单选题】The pen I ___ I ___ is on my desk, right under my nose.
A.
think, lost
B.
thought, had lost
C.
think, had lost
D.
thought, have lost
【简答题】(bare) _________ had the spokesman sat down when the reporters started asking questions.
【单选题】Your pen is very nice! Let me ______. [ ]
A.
have a look
B.
do my homework
C.
do a survey
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