[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606172502_75606.png" alt="" />
A.1/3
B.1/2
C.2/3
D.3/4
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正确答案： A 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606172558_18150.png" alt="" />
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