设L是半圆y=√Rx-x2上从点A(R，0)到点O(0，0)的弧段(R＞0)，则曲线积分(下式中k为常数)∫L(exsiny-ky)dx+(excosy-k)dy=()
A.(kπ/4)R2 B.kπR2/6 C.kπR2 D.kπR1/10正确答案C
设L是半圆y=√Rx-x2上从点A(R，0)到点O(0，0)的弧段(R＞0)，则曲线积分(下式中k为常数)∫L(exsiny-ky)dx+(excosy-k)dy=()
A.(kπ/4)R2 B.kπR2/6 C.kπR2 D.kπR1/10正确答案C
