如图中的曲线表示某物质经过正常人肾小管的含量变化情况.据图推断,该物质是( )
A:尿素
B:水分
C:葡萄糖
D:无机盐
─ Mrs. Zhang was sent to teach English in a poor mountain village last year.
─ She said she would never forget some pleasant ______ while working there.
下列事实能说明某物质是强电解质的是( )
钠摄入过量或钾摄入不足都是导致高血压的风险因素.日常生活中选择食用低钠盐能实现减钠补钾.如图为某品牌低钠盐的标签,请你根据标签回答以下问题: