【单选题】Mrs. Black doesn’t believe her son is able to design a digital camera, ?
【单选题】在粘膜局部主要起免疫作用的抗体是[1分]
【单选题】I am afraid that Mrs. Black doesn’t believe her son is able to design such a complicated machine, ?
【简答题】9 Mrs. Black doesn’t believe her son is ableto design a digital camera, ?A. is she B. isn’t she C. doesn’t she D. does she
【简答题】Mrs.Black doesn’t believe so many people are suffering from this tsunami,__________? A.aren’t they B.are they C.doesn’t she D.does she
【简答题】已知函数 . (Ⅰ)化简 的表达式并求函数的周期; (Ⅱ)当 时,若函数 在 时取得最大值,求 的值; (Ⅲ)在(Ⅱ)的条件下,将函数 图象上各点的横坐标扩大到原来的 倍,纵坐标不变,得到函数 的图象,求函数 的单调递增区间.
【简答题】已知函数 ( ) (Ⅰ)求函数 的周期和递增区间; (Ⅱ)若 ,求 的取值范围.