将溶质A的质量分数为5X%和X%的两种溶液等体积混合，所得溶液中A的质量分数小于3X%，则A可能是 （ ） ①H2SO4 ②C2H5OH ③NH3 ④CH3COO
某CuO粉末与适量硫酸(ρ=1.7g/cm3)在微热下充分反应(设反应过程中无水份损失)，冷却后恰好全部形成CuSO4·xH2O，若此硫酸溶液的物质的量浓度为10.8mol/L，则
洋务思潮、维新思潮和共和思潮的兴衰反映了近代前期的历史主流，下列关于中国近代前期历史主流的表述，最为确切的是
孔子周游列国，宣扬自己的主张，结果不断碰壁，主要原因是 A. “仁”和“礼”的思想自相矛盾，不利于稳定社会秩序 B. 维护周礼的政治理想不符
When high school started, Becky and I became best friends. We ____41__ many interests and quickly became inseparable. When high school ended, we both cried because we would attend different college
I preferred _______the long jump rather than ________ in the relay race in the school sports games. A. to choose; to run B. choosing; to run C. choosing; run D. to choo
当前，余额宝、现金宝、活期宝等理财产品层出不穷。用户将闲置资金存入各类“宝”。既可以获得较高的收益，也能将“宝”中的钱随时用于消费和
After a long discussion, they an agreement. (协议) A. came into B. came out C. came to D. came across
