单项选择题
信号
如图所示，其付氏变换为（ ）
A．
B．
C．
D．
信号
如图所示，其付氏变换为（ ）
A．
B．
C．
D．
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单项选择题
What should a reporter do when in his research he could not find any formal study that forecasts the future?
What should a reporter do when in his research he could not find any formal study that forecasts the future?
A．He can put in his own opinions on what might happen in the foreseeable tomorrow.
B．He can ask the people to predict the future who are directly involved in the development central to the story.
C．He can talk to his friends and ask about their opinions on what might happen in the future and use their predicting words in the story.
D．None of the above.