单项选择题

基础知识,章节练习,土木工程师（水利水电）现代技术基础,信号与信息基础

A.物理信号
B.模拟信号
C.离散信号
D.连续信号
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单项选择题
A.B.C.D.
A.
B.
C.
D.
单项选择题
You have another ship overtaking you close aboard to starboarD.You have 3 radar targets bearing 090° relative at ranges of 0.5 mile，1 mile，and 1.5 miles．In this case，the unwanted echoes are called ______．A.Multiple echoesB.SpokingC.Indirect echoesD.Side-lobe echoes
A.You
B.5
C.5
D.In
E.
A.Multiple
F.Spoking
C.Indirect
G.Side-lobe
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