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单项选择题

已知某连续时间系统的单位冲激响应
       
则该系统的频率响应为

A．
B．
C．
D．
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单项选择题

The ________ date and time and place of the event should be clearly stated in an invitation card.
A、specific
B、clear
C、special 
D、definite
单项选择题

Conversation 1 
7 A.
A)To ask for a leave for America
B.
B)To buy some products from her.
C.
C)To confirm the meeting with her.
D.
D) To apply for a job in Stanford Group.
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