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【简答题】
通常把时间和幅度上都是离散的信号称为（）信号，而时间和幅度上都是连续的信号则称为（）信号。
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皮皮学刷刷变学霸
举一反三
【单选题】Listen to the conversation and choose the best answer for the questions. The man tells the girl
A.
that he will call again
B.
to ask her father to call him later
C.
that he will come later
【简答题】Listen! The girl ____(sing) in the next room.
【单选题】Listen to the conversation and choose the best answer for the questions. What does the girl refuse to tell the man?
A.
Her age.
B.
Her name.
C.
Her address.
【简答题】Listen! The girl __ （sing) in the classroom.
【简答题】三个人独立地去破译一份密码，已知各人能译出的概率分别为1/5，1/3，1/4，问三人中至少有一人能将此密码译出的概率为多少?
【单选题】测量仪表依据所测物理量的不同,可分为()。
A.
压力测量仪表、物位测量仪表、流量测量仪表、温度测量仪表、分析仪表等
B.
指示型、记录型、讯号型、远传指示型、累积型等
C.
工业用仪表和标准仪表
D.
以上都不对
【单选题】Listen to the conversation and choose the best answer for the questions. According to the girl, her father
A.
is not at home
B.
is on another line
C.
can't come to the telephone
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