皮皮学，免费搜题
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【单选题】
下列哪种变化是干制品的物理变化A.
干缩
B.
蛋白质变性
C.
脂肪氧化
D.
褐变
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参考解析：
知识点：
皮皮学刷刷变学霸
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【多选题】The Grand Canal was helpful in________.
A.
national unity
B.
economic development
C.
protecting the environment
D.
boosting the local agriculture
【简答题】已知f(t)=u(t)cos2t，其中u(t)为单位阶跃函数，试求f(t)的Fourier变换．
【单选题】The Grand Canal was first excavated in ________.
A.
the Han Dynasty
B.
the Warring States period
C.
the Spring and Autumn Period
D.
the Sui Dynasty
【单选题】Mass media was born. And this ________ a whole new world.
A.
open
B.
open up
C.
opened up
D.
opened
【单选题】听力原文：M: What did you major in besides English? W: I majored in education, too. Q: What did the woman major in? (17)
A.
English.
B.
English and Education.
C.
Education.
D.
Neither English nor Education.
【简答题】下列腧穴中，治疗汗证首选（ ）
【简答题】听力原文：Q: In order to breathe, what did the mother put over their faces? In order to breathe, what did the mother put over their faces?
【单选题】已知f1(t)=2[u(t+1)-u(t-1)],f2(t)=u(t)-u(t-2),若f(t)=f1(t)*f2(t),则f(0)=( )。
A.
1
B.
2
C.
3
D.
4
【简答题】发动机的分类方法有:按进气系统是否增压分 和 。
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