对构造式 H_2C=CH-CH=CH_2 的理解正确的是:

A. 是1，3-丁二烯的真实结构

B. 是1，3丁二烯的结构之一

C. 是1，3-丁二烯的一个极限式，该式子代表的结构不是真实存在的

D. 是1，3-丁二烯的一个极限式，该式子代表的结构也是真实存在的

参考答案与解析：

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