A:用氨水不能鉴别Al(NO3)3、AgNO3、KNO3三种溶液
B:下图所示的装置可用于干燥、收集并吸收多余的氨气
C:少量的CO2通入苯酚钠溶液中生成NaHCO3,说明酸性:H2CO3>C6H5OH>HCO3—
D:淀粉和稀H2SO4混合加热后,再加新制的Cu(OH)2悬浊液加热至沸腾,无砖红色固体生成,说明淀粉没有水解
生物体结构和功能相适应的实例很多,下列表述不正确的是( )
绝对值等于4的所有整数是____ .
我国公民行使国家权力、参与国家管理的一项最基本的政治权利是( )
动词填空 (1)Our teacher told us that the earth ____ (move ) around the sun.(2)Audrey Hepburn ____ (honour) with a number of awards during her lifetime.(3) Why didn’t you understand the problem? I explained it just now. Sorry, I ____ (consider) where to spend my holiday.(4)Please stop talking, guys. I can’t hear what the youth worker____ (announce).(5)How happy the students from different countries were ____ (see) each other yesterday!(6)The old man seems rather sad. Perhaps he____ (lose) something important.(7)Before I saw the film, I____ (not see) a film for 2 years.(8)His parents promised that they ____ (take) him to the USA if he did well in all his subjects.