<img src=https://huaweicloudobs.ahjxjy.cn/E8A49C321411FF54CB54EDE7F0D4589B.png title=QQ截图20170105215056.png alt=QQ截图20170105215056.png style=white-space: normal;/>

【单选题】【消耗次数：1】

① 充分不必要条件

② 必要不充分条件

③ 充分必要条件

④ 既不充分又不必要条件

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① 充分不必要条件

② 必要不充分条件

③ 充分必要条件

④ 既不充分又不必要条件

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