【多选题】固体废物采样份样数(采样单元)的确定主要依据有:
【单选题】I can't remember _______ I put the book, and I need it for my homework now. [ ]
【单选题】要研究导体的电阻与导体的材料是否相关,我们必须要控制的因素有( )
【单选题】I can't remember a single time that my parents explicitly told me I love you.
【单选题】I can't remember my password! But I _____ written it in my notebook as sometimes I do that.