问题
单项选择题
Tariffs may ______ on commodities leaving an area or on merchandise entering an are
A．A. levyB. be leviedC. effectD. be effected
答案
参考答案：B
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Tariffs may ______ on commodities leaving an area or on merchandise entering an are
A．A. levyB. be leviedC. effectD. be effected
参考答案：B
平面相交的舌向角约为()