区别是：which不能放在句首，而as则可以；在句中，as有“正如”“就象”之意，而which则没有此意；2）当先行词前有thesame，such修饰时，或在“soas…as”结构中，表示“那样……以致”，后用关系代词as引导限制性定语从句；3在such…as结构中，为关系代词，as替代先行词，引导的是定语从句；such…that在结构中，that为连词，引导的是一个完整的结果状语从句。
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