In the past two decades, nontariff trade barriers have gaine in importance as protectionsit devices.The major nontariff trade barriers include:



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單項選擇題

懸浮顆粒物中的細顆粒是指粒徑()的懸浮顆粒物

A.小于 2.5μm
B.大于 2.5μm
C.小于 10μm
D.大于 10μm