正确解答
1.(△)2.(×）3.(×）4.(×）5.(×）6.(×）7.(△)8.(○)9.(○)10.(×）11.(△)12(○)13.(△)14.(△)15.(○)16.(△)17.(○)18.(○)19.(△)20.(△)21.(△)22.(○)23.(×）24.(×）25.(△)26.(×）27.(○)28.(×）29.(○)30.(△)
