二维复值函数<img src="https://static.zxtiku.com/wangke/imgs/topic/80e79840267d1b81c9bd37fc6f664655.jpg"/>二维傅里叶变换的定义为（） A. <img src="https://static.zxtiku.com/wangke/imgs/topic/c380c7c3c99cd5aac9c54ababecf1e45.jpg"/> B. <img src="https://static.zxtiku.com/wangke/imgs/topic/af69bcb2eb297a945ee104e7d4f7ee01.jpg"/> C. <img src="https://static.zxtiku.com/wangke/imgs/topic/6506cb6d64bc01d82a7ecc874a2534c2.jpg"/> D. <img src="https://static.zxtiku.com/wangke/imgs/topic/67173a270e0d94c8f0cad78e654b3a3f.jpg"/>