设 f ( x ) 、 g ( x ) 在 x 0 处可导,且 f ( x 0 )= g ( x 0 ), f' ( x 0 )= g' ( x 0 ), 若 h ( x ) 在 x 0 的某邻域内满足 f ( x ) ≤ h ( x ) ≤ g ( x ), 证明 h ( x ) 在 x 0 处可导,并且 f' ( x 0 )= h' ( x 0 )= g' ( x 0 )
【简答题】The word 'gasoline' and 'petrol' are [A] synonyms differing in emotive meaning. [B] dialectal synonyms. [C] synonyms differing in style. [D] collocationally-restricted synonyms.