题型:单项选择题 I like getting up very early in summer. The morning air is good _______.A.to be breathedB.being breathedC.breathingD.to breathe 查看答案
题型:单项选择题 测得一10.00ml含锌试液的极谱波高为4.0mm,若加入1.00×10-2mol/L锌标准溶液0.50ml于该试液中,则混合液的极谱波高为9.0mm。试液中锌的浓度为()A.1.64×10-4mol/LB.3.67×10-4mol/LC.2.00×10-4mol/LD.4.00×10-4mol/L 查看答案