题目: 下列电离方程式书写正确的是[ ]A.H2SO4 = H22+ + SO42- B.NaHCO3 = Na+ + H+ + CO32-C.NaOH = Na+ + O2- + H+D.Na3PO4 = 3Na+ + PO43- 答案: 答案:D
题型:选择题 She told us a story, and her voice sounded _______. We’re interested in it.A. sweet B. small C. clearly 查看答案