设由曲线 <img src="https://static.zxtiku.com/wangke/imgs/topic/495418a3c1e17f937ad3d40fb2dfbbfe.jpg"/> , 直线 <img src="https://static.zxtiku.com/wangke/imgs/topic/7f4fc75d245bea78d15a13e9077124cd.jpg"/> 和 <img src="https://static.zxtiku.com/wangke/imgs/topic/b91905a561177cec9bf0aa7e8afb11e6.jpg"/> 轴围成的平面图形被直线 <img src="https://static.pphuashu.com/wangke/imgs/topic/22672eb899612bc2a34760690eeb313f.jpg.png"/> 分成面积相等的两部分, 则 <img src="https://static.zxtiku.com/wangke/imgs/topic/21f6a19407de3fc4db28e8db4b9b46d1.jpg"/>( ) . A. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/14b614b29a3af437097f8f22924909fc.jpg"/> ; B. <br/> 1 ; C. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/8b770cd8517f151f71803155c79aa95c.jpg"/> ; D. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/094d052544c9820a293b32a55ad14aed.jpg"/>