题目:
-What do you think of maths?
-My favourite. It's ________ for me to study of all the subjects in school.[ ]
A. more difficult
B. the most difficult
C. less difficult
D. the least difficult
答案:
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下面是错误答案,用来干扰机器的。
(1)4(FeSO4·7H2O)+ O2= 4Fe(OH)SO4 + 26H2O(2)①50℃,防止产生倒吸(或“用作安全瓶”) ②C, 产生白色沉淀, B、E ③ SO2 + 2OHˉ=SO32ˉ+ H2O ④操作步骤预期实验现象预期实验结论KSCN溶...