【单选题】
Lucy _____ her desk yesterday.
【单选题】
He __________ five telephone calls to his parents.
【单选题】
The day we were married was _________day of my life.
【单选题】
It is going to rain. The sky is getting _________ and ________.
【单选题】
The old man ______ across the street
【单选题】
The boy _______ his hands just now.
【单选题】
The rich get __________ and the poor get _________.
【单选题】
下列函数中,是微分方程<img src=https://huaweicloudobs.ahjxjy.cn/F38A704C30F26A3D943BAE648C24B782.png title=图片22.png alt=图片22.png/>的解的是()
①
<img src=https://huaweicloudobs.ahjxjy.cn/6319AB7838F334F1944C50EBF6DF13F2.png title=图片23.png alt=图片23.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/B45A01DA994ED771A50F14A3C9DE6927.png title=图片24.png alt=图片24.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/8795DDC607ED59A1A033CD320F00D252.png title=图片25.png alt=图片25.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/B8BD69D97A191A7EAB2B1298B5F9D619.png title=图片26.png alt=图片26.png/>
【单选题】
下列级数中,属于条件收敛的是( )
①
<img src=https://huaweicloudobs.ahjxjy.cn/839662E1C8B743EF41CA74747568423B.png title=图片18.png alt=图片18.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/5DE316DD726D15D83E04B8D688037A5F.png title=图片19.png alt=图片19.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/DEAEF5A321E07920CF86D02DDA74F9B8.png title=图片20.png alt=图片20.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/82BFAC2BC8B6DD3FA8DA4ACAB0CBB063.png title=图片21.png alt=图片21.png/>
【单选题】
二重极限<img src=https://huaweicloudobs.ahjxjy.cn/C579B1186CAE8AAFEEAE63AF0DBA6DD4.png title=图片16.png alt=图片16.png/>()