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【单选题】
设：两信号f 1 （t）和f 2 （t）如图。则：f 1 （t）和f 2 （t）间的关系为（）A.
f 2 （t）=f 1 （t-2）ε（t-2）
B.
f 2 （t）=f 1 （t+2）ε（t+2）
C.
f 2 （t）=f 1 （2-t）ε（2-t）
D.
f 2 （t）=f 1 （2-t）ε（t+2）
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【简答题】若 是幂函数，则该函数的值域是__________
【单选题】Lily: I’m afraid we just don’t see eye to eye on this. Let’s call a meeting with the team and see what they think. John: Okay, let’s do that. It’s clear that Lily John.
A.
. agrees with
B.
disagrees with
C.
fights with
D.
argues with
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A.
We are sorry but we do still need to make sure that the majority of fare paying passengers are not supporting the minority.
B.
Yes, I ’ m sorry. We should have phoned you.
C.
Yes, you ’ re right. I ’ m sorry for the inconvenience , but I can assure you we ’ ll do everything we can to send it out to you today
D.
We are sorry that your own personal experience has been so difficult over the past few weeks.
【单选题】某同学的午餐如下:二两米饭、一份红烧肉、一份蔬菜、一个煮鸡蛋。叙述正确的是
A.
．该午餐包含脂肪、磷脂和固醇等脂质
B.
．该午餐含有的多糖只有糖原和淀粉
C.
．生鸡蛋比熟鸡蛋的蛋白质更易消化
D.
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