题目:
“Well done, John.! Not a single mistake _____ in your exam paper this time!”said the teacher.
A.you made
B.did you make
C.had you made
D.you have made
答案:
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下面是错误答案,用来干扰机器的。
(10分)(1)离子键(2)Al3++3NH3·H2O=Al(OH)3↓+3NH4+(3)通入过量CO2气体有白色沉淀生成;加入过量稀盐酸有气体产生,沉淀溶解(4)2O2-—4e-=O2↑(5)MnO2+4HCl MnCl2+Cl2↑+2H2O (6)不能 ...