<img src=https://huaweicloudobs.ahjxjy.cn/33CD9100EB360BCC7C8004EC657ED981.png title=Unnamed QQ Screenshot20170106195748.png alt=Unnamed QQ Screenshot20170106195748.png style=white-space: normal;/>

【单选题】【消耗次数：1】

① 无解

② 仅有零解

③ 必有非零解

④ 也可能有非零解，也可能没有非零解

参考答案：

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