下列应用或事实与胶体的性质没有关系的是( ) A.用明矾净化饮用水 B.放电影时,放映室射到银幕上的光柱 C.氯化铁溶液中滴入氢氧化钠溶液出现
Last week, Rahman's wife had an accident. Rahman's youngest child, Yusof. was at home when it happened. He was playing with his new toy car. Rahman had given it to him the week before for his third
导体两端的电压为6V,通过导体的电流为2A,通电时间为10s,电流做功 J。
.The new dictionaries are very useful. They ________ well and ________ already . A. sell; have been sold out B. sold; had sold out C. sell; sell out D. are sold; have been sold out
在的展开式中,只有第5项的二项式系数最大,则展开式中含项为 第_____项。
“民之饥,以其上食税之多,是以饥。民之难治,以其上之有为,是以难治”。这体现了哪个思想家的什么思想?( )A. 老子 无为而治,缓和矛盾
(08年苏州中学期中)长为0.2m的导线垂直于某匀强磁场方向放置,当导线中通有1A的电流时,导线受到的安培力大小为0.8N,当该导线中的电流增大到2A
利用NO2平衡气体遇热颜色加深、遇冷颜色变浅来指示放热过程和吸热过程。 ①按图所示将实验装置连接好。 ②向甲烧杯的水中投入一定量的CaO固体,