二重积分<img src="/lqwvjeImg/98/9807f73378ad160fadd3aff61eccdf82.png"style="width:356px;height:64px;">在极坐标系中可化为 ( )<br>·<img src="/lqwvjeImg/1a/1a9af0f41b3823a0ba43f7b8d0871af0.png"style="width:148px;height:57px;"><br>·<img src="/lqwvjeImg/f5/f5b47f1381b08f5893cfaba904783d26.png"style="width:148px;height:57px;"><br>·<img src="/lqwvjeImg/db/db6215b14f7a82bd7865af4899ca36e4.png"style="width:152px;height:66px;"><br>·<img src="/lqwvjeImg/ed/edbf62971c52759ea0320db242797f14.png"style="width:153px;height:66px;">