【单选题】I don't have _____ pencils. I want to buy _____. [ ]
【单选题】I haven’t got ______ apples, but I have got ______ oranges. [ ]
【单选题】— Can I borrow ________ money from you? — Sorry, I don't have ________. [ ]
【判断题】绿色透辉石又称为铬透辉石,吸收光谱显示铬线。( )
【单选题】有一ZnCl2水溶液,m=0.002mol·kg-1,γ±=0.83,则a±为:( )
【简答题】应用德拜-休克尔极限公式计算25℃时0.005mol·kg -1 的ZnCl 2 水溶液的离子平均活度因子。
【单选题】I don't have rulers. But I have erasers. [ ]
【单选题】What can I do for you? I’d like .