甜菜肉质贮藏根液泡中的花青素使块根呈红色,将此根切成小块,放入蒸馏水中,水的颜色无明显变化;若先用盐酸处理此根,再放入蒸馏水中,则水
I was the middle child of three, and there was a gap of five years on _____ side.A. one B. either C. both
I haven’t seen Ann for ____ long that I’ve forgotten what she looks like.A. such B. very C. so
鱼缸中装满水,在水中轻轻放入一只小船,小船漂浮在水面上,从鱼缸中溢出5×10-4m3的水,则小船受到的浮力是 N,小船所受的重力与浮力的关
如下图,已知△ABE≌△ACD,∠1=∠2,∠B=∠C,不正确的等式是( ) A.AB=AC B.∠BAE=∠CAD C.BE=DC D.AD=DE
如图,Rt△ABC中,∠ACB=90°,∠A=50°,将其折叠,使点A落在边CB上A′处,折痕为CD,则∠A′DB为 .
(2010·山东聊城一中高三模块测试) 29.She showed us the whole dance first, then _________so that we could learn it more easily. A.got it through B.carried it out C
能源、信息和材料是现代社会发展的三大支柱,关于它们下列说法中正确的是( ) A.超导体材料主要是应用在电饭锅等电器上B.大亚湾核电站利用