题型:选择题 常温下,下列各组离子在指定溶液中一定能大量共存的是A.使石蕊变红色的溶液:Fe2+、K+、SO42-、NO3-B.使酚酞变红色的溶液:Na+、Cu2+、HCO3-、NO3-C.0.1 mol·L-1AgNO3溶液:H+、K+、SO42-、I-D.0.1 mol·L-1Na2CO3溶液: OH—、Na+、Cl-、SO42- 查看答案
题型:选择题 Have you ever felt your cheeks get hot,your palms sweaty or been afraid to _______your teachers’ eyes when they are about to call on someone?A.take onB.look intoC.occur toD.look up 查看答案