若<img src="/lqwvjeImg/56/567ed9473a5ad1e6b98f1643ad1070a7.png"style="width:15px;height:17px;">为圆周<img src="/lqwvjeImg/81/8174b24f82421adc66cb3935ba6953dd.png"style="width:83px;height:24px;">,则曲线积分<img src="/lqwvjeImg/8b/8bbb3cc90c54d5ece29a39b05d4c645c.png"style="width:105px;height:31px;">( )。<img src="/lqwvjeImg/49/4961d6c2bb8f75169a36db60b933f0b6.png"style="width:25px;height:18px;"><img src="/lqwvjeImg/af/afbd7b062d547aec874a8164bc53010f.png"style="width:31px;height:21px;"> <img src="/lqwvjeImg/88/886e3067847fbbbdeddad27e1c6e2c32.png"style="width:24px;height:18px;"><img src="/lqwvjeImg/16/16418a0d7c208c1e2cc7e8d10bb23b42.png"style="width:31px;height:21px;"> <img src="/lqwvjeImg/25/25fa0524dca219647f451ea62fc28138.png"style="width:24px;height:18px;"><img src="/lqwvjeImg/59/59949e034cb46313a8fcd2006b7095fc.png"style="width:39px;height:21px;"> <img src="/lqwvjeImg/18/184b82dde95571cbc5d92a5e1e09a224.png"style="width:25px;height:18px;"><img src="/lqwvjeImg/63/63dcf2736557d1b640ed0ab188f8d277.png"style="width:39px;height:21px;"><br>·<img src="/lqwvjeImg/af/afbd7b062d547aec874a8164bc53010f.png" <br>·<img src="/lqwvjeImg/16/16418a0d7c208c1e2cc7e8d10bb23b42.png" <br>·<img src="/lqwvjeImg/59/59949e034cb46313a8fcd2006b7095fc.png" <br>·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16974238523527ae0f0a541344a2a9caedd2a13697b6fimage11.png"

若

为圆周

,则曲线积分

( )。

·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16974238523527ae0f0a541344a2a9caedd2a13697b6fimage11.png"

出自：河南工业大学钢筋混泥土结构

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