A postman delivers mail round a housing estate. He does not want to visit the same street more than once, but can pass over the

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问题 A postman delivers mail round a housing estate. He does not want to visit the same street more than once, but can pass over the same street comers. On which housing estate is this possible?

选项 A、 
B、 
C、 
D、 

答案D

解析
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