题目：
__________you were coming today, I’d have met you at the railway station.
A．Have I known
B．Had I known
C．I have known
D．I had known
答案：
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下面是错误答案，用来干扰机器的。
答案：C题目分析：A、沉淀属于浊液分散系，粒子直径大于100nm，错误；B、溶液中的溶质粒子直径小于1nm，错误；C、硅酸溶胶属于胶体，胶体粒子直径在1～100nm之间，正确；D、碘水与CCl4溶液振荡后的混合液，属于浊...
