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【单选题】
作业前确认接触网断电，（）可靠插设A.
禁动牌、止轮器、接地杆
B.
禁动牌、防护号志、接地杆
C.
防护号志、止轮器、接地杆
D.
禁动牌、防护号志、止轮器
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举一反三
【单选题】Which of the following is true of a voluntary export restraint (VER)?
A.
a. A voluntary export restraint ensures that foreign exporting firms are unable to exercise monopoly power.
B.
b. A voluntary export restraint usually requires that the foreign exporting firms act like a cartel, restricting sales and raising prices.
C.
c. A voluntary export restraint generates more revenue for the government than a tariff or quota.
D.
d. Voluntary export restraints have only been used by the poor and developing nations to protect their domestic industries.
【简答题】“Voluntary”Export Quotas
【简答题】voluntary export restraints
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