关于下图阀门1、2、3开关说法正确的是？<img src="https://file.icve.com.cn/file_doc_public/30/993/079F87B8158269A268A553B77D23DDFD.png" title="1.png" alt="1.png"/>

【单选题】【消耗次数：1】

① 要发出球，1、2、3阀门都开

② 要发出球，1、2阀门开，3阀门关

③ 要发出球，1阀门关，2、3阀门开

④ 要发出球，2阀门关，1、3阀门开

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