A:无色透明的溶液中:Cu2+、K+、SO42﹣、NO3﹣
B:使无色酚酞试液呈红色的溶液中:Na+、K+、SO42﹣、CO32﹣
C:NH4Cl溶液中:K+、OH﹣、SO42﹣、Cl﹣
D:pH=1的溶液中:Na+、K+、HCO3﹣、NO3﹣
下列词语中划线的字,注音全都正确的一项是( )
判断某溶液是酸性溶液的方案错误的是( )
根据句意及词首字母或汉语提示,补全单词。(1)Don't talk l____ in the classroom. It's impolite(不礼貌的).(2)The movie is so boring. I can't s____ it.(3)The clothes shop is on sale. This shirt is very c____ .(4)Yesterday, Kate studied for the English t____ .(5)Please ____ (记住)to turn off the lights.
①自信使人有克服困难的勇气和自强不息的力量
②自信是成功的基石
③自信能挖掘自身的潜能
④自信的人就能取得成功