5.1定积分基本概念和性质测试题 6. 下列命题不正确的是( ) A. <img src="https://static.zxtiku.com/wangke/imgs/topic/68449c30e55f43a4ac868dd1a1a56df2.jpg"/> B. <img src="https://static.zxtiku.com/wangke/imgs/topic/6459fae52597c7eaf7a7d4d09d532f49.jpg"/> C. <img src="https://static.zxtiku.com/wangke/imgs/topic/7a655c4b9b51848904fb9ffe1063162e.jpg"/> D. <img src="https://static.zxtiku.com/wangke/imgs/topic/f5d3bafa36618fb438e886dfdba4338f.jpg"/>