问题
单项选择题
出口节流调节方式比进口节流方式经济性（）。
A.增加
B.降低
C.不变
答案
参考答案：B
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出口节流调节方式比进口节流方式经济性（）。
A.增加
B.降低
C.不变
参考答案：B
选词并用其适当形式填空。
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