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【单选题】
( )具膜质托叶鞘。A.
伞形花序
B.
蔷薇科
C.
藜科
D.
科
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【简答题】若（x+t）（x+6）的积中不含x的一次项，则t的值为______．
【简答题】He always to work by bike when he was in Shanghai. (go)
【简答题】He always ( go ) to work by car.
【简答题】Every morning Tom goes to work by train. He has a long way to go. So he always buys a newspaper. It helps him to spend the time on the train. Tom likes sport very much. One morning on the train he is ...
【简答题】Every morning Jim goes to work by train. He has a long way go to. So he always buys a newspaper. It helps Jim to spend(度过) the time on the train. Jim likes sport very much. One morning on the train he...
【单选题】He is very ____________. He always go to work on time.
A.
modest
B.
fair
C.
punctual
D.
skillful
【简答题】--How he ( go ) to work? --He always ( go ) to work by car.
【简答题】证明，若对于函数f(x)(-∞＜x＜+∞)，等式f(x+T)=kf(x)成立，k与T为正数，则f(x)=a x φ(x)，a为正常数，φ(x)是以T为周期的周期函数
【简答题】X(t)为一随机过程，a为常数，试以X(t)的自相关函数表出随机过程 y(t)=X(t+a)一X(t) 的自相关函数．
【简答题】已知x(t)为矩形脉冲信号，求y(t)=x(t)*x(t)的傅里叶变换。
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