计算下列线积分:

A . I=1 B . I=-1 C . I=1／2 D . 此广义积分发散

A . 分2段，共有2个积分常数 B . 分2段，共有4个积分常数 C . 分3段，共有6个积分常数 D . 分4段，共有8个积分常数

A . 5 B . 10 C . 15 D . 20

用极坐标计算<img src='https://img2.soutiyun.com/ask/2021-01-27/980590799469038.png' />时，积分限如何配置(写出下列区城上的两种逐次积分)？ <img src='https://img2.soutiyun.com/ask/2021-01-27/980590817042043.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-27/980609000944103.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-19/966695558886495.png' /> <img src='https://img2.soutiyun.com/ask/2020-08-19/966695575372438.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/66336001-66339000/66338983/965573894045574.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-11/966013448299817.png' />

A．可以任意假设；B．可用幂次多项式表示，系数由边界条件确定； C．若未知精确解很难确定。

计算下列积分(利用留数，圆周均取正向)． <img src='https://img2.soutiyun.com/ask/uploadfile/9075001-9078000/1504c20edfe66d1baeae69b67472a287.jpg' />

广义积分<img src='https://img2.soutiyun.com/shangxueba/ask/17667001-17670000/17668564/2015102711243320187.jpg' />，则计算后是下列中哪个结果（）？ A．I=1 B． I=-1 C． I=1／2 D． 此广义积分发散

<img src='https://img.soutiyun.com/ask/zq/20210712/994955666781681.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-04/968077344097219.png' />

计算下列无界函数的反常积分(发散也是一种计算结果): <img src='https://img2.soutiyun.com/ask/2020-12-16/976980402679191.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-27/980593228129949.png' />

<img src='https://img2.soutiyun.com/ask/2020-11-25/975182524269127.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-11/965988523545203.png' />