下图是一个健康人原尿流经肾小管形成尿液的过程中某种物质 A.水 B.无机盐 C.葡萄
节能减排、低碳出行是我们倡导的生活方式.下列有关二氧化碳的说法正确的是( ) A.二氧化碳通入紫色石蕊溶液中,溶液变为红色,说明二氧化碳
3.6g CaCO3高温煅烧一段时间后,冷却,测得剩余固体中含钙元素57.6%,求剩余固体中CaO的质量.
进化论作为一种科学理论,至迟在19世纪80年代已被初步介绍到中国,但其仅仅是众多科学理论之一种,并没有得到中国知识界的特别重视,到了90年代
函数的单调增区间与值域相同,则实数的取值为 ( ) A. B. C. D.
One of my close friends made great progress in her studies so her teachers ______ her, and I ______ her.( ) A. were happy with; was happy with B. were happy for; was happy for C. wer
He looked quite healthy though he was __________. A. in seventy B. in his seventy C. at seventiesD. at the age of seventy
若曲线上点处的切线平行于直线,则点的坐标是________.