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【单选题】
In the specific factors model, the effects of trade on welfare are ________ for mobile factors, ________ for fixed factors used to produce the exported good, and ________ for fixed factors used to produce the imported good.A.
ambiguous; positive; negative
B.
ambiguous; negative; positive
C.
positive; ambiguous; ambiguous
D.
negative; ambiguous; ambiguous
E.
positive; positive; positive
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举一反三
【简答题】某种纱线的细度表示为15tex×3,请说出它的含义。
【单选题】A clean environment can help the city bid for the Olympics, which will promote its economic development. [ ]
A.
in nature
B.
in return
C.
in turn
D.
in fact
【单选题】A clean environment can help the city bid for the Olympics, which ________ will promote its economic development.
A.
innature
B.
inreturn
C.
inexchange
D.
infact
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