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【单选题】
A problem encountered when implementing an "infant industry" tariff is that ___________.A.
domestic consumers will purchase the foreign good regardless of the tariff.
B.
the industry may never "mature."
C.
most industries require tariff protection when they are mature.
D.
the tariff may hurt the industry's domestic sales.
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【单选题】设 是二阶齐次线性微分方程 的两个线性无关的特解,则 ( 为任意常数)( ).
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是该方程的通解;
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