下列方程中是常微分方程的是（）

【单选题】【消耗次数：1】

下列方程中是常微分方程的是（）

① <img src=https://huaweicloudobs.ahjxjy.cn/564BBAABA52FDB03817AC3E44B43BE85.png title=)PY7$S}PBSPTO3WO6%FC[K4.png alt=)PY7$S}PBSPTO3WO6%FC[K4.png/>

② <img src=https://huaweicloudobs.ahjxjy.cn/F42BD3E8202E20213DB4120F54202A8B.png title=[PHLS@HH@K%V2ZQ92MM]BG7.png alt=[PHLS@HH@K%V2ZQ92MM]BG7.png/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/F1BB7F9AD9932A4DE7E9967150ED9809.png title=862U~4DO2528QIINE{[ZQRA.png alt=862U~4DO2528QIINE{[ZQRA.png/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/66F2F70E1D313377614BFEE12419CC07.png title=IS8C43Z@WY)MDHN7TO4X6}B.png alt=IS8C43Z@WY)MDHN7TO4X6}B.png/>

参考答案：

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