积分支持二次申诉吗？

A .https://assets.asklib.com/psource/2015102917011683633.jpg B .https://assets.asklib.com/psource/2015102917014467452.jpg C .https://assets.asklib.com/psource/2015102917032793192.jpg D .https://assets.asklib.com/psource/2015102917034437496.jpg

A .https://assets.asklib.com/psource/2015102908463839977.jpg B .https://assets.asklib.com/psource/2015102908465216566.jpg C .https://assets.asklib.com/psource/2015102908470733418.jpg D .https://assets.asklib.com/psource/201510290847219913.jpg

A . 正确 B . 错误

A .https://assets.asklib.com/psource/2015102915210334288.jpg B .https://assets.asklib.com/psource/2015102915211626790.jpg C .https://assets.asklib.com/psource/2015102915213172096.jpg D .https://assets.asklib.com/psource/2015102915214446563.jpg

A .https://assets.asklib.com/psource/2015102817295118607.jpg f（rcosθrsinθ）rdrB .https://assets.asklib.com/psource/2015102817295678522.jpg f（rcosθ，rsinθ）rdrC .https://assets.asklib.com/psource/2015102817300014340.jpg f（rcosθrsinθ）rdrD .https://assets.asklib.com/psource/2015102817300527359.jpg f（rcosθ，rsinθ）rdr

A . 正确 B . 错误

是 否

使用第一换元积分法(凑微分法)求不定积分<img src='https://img2.soutiyun.com/ask/2020-08-13/966188693002378.png' />的关键是什么？有一定的规律吗？

二次积分<img src='https://img2.soutiyun.com/shangxueba/ask/17676001-17679000/17676154/2015102917004746434.jpg' />交换积分次序后的二次积分是（）。 A．<img src='https://img2.soutiyun.com/shangxueba/ask/17676001-17679000/17676154/2015102917011683633.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/17676001-17679000/17676154/2015102917014467452.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/17676001-17679000/17676154/2015102917032793192.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/17676001-17679000/17676154/2015102917034437496.jpg' />

是 否

<img src='https://img2.soutiyun.com/ask/2021-01-10/97914323460899.png' />

A.可以 B.不可以

是 否

<img src='https://img2.soutiyun.com/ask/2020-12-22/977523701056398.png' />