皮皮学，免费搜题
登录
搜题
【简答题】
标准AM调幅要求调制信号的最大幅度要小于等于直流分量 ,原因是 这样已调信号的包络与原调制信号包络形状完全相同,可以使用 法从已调信号中将调制信号解调出来 。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】When were you born?
【单选题】When were you born? I was born _____.
A.
on July 3rd, 1972
B.
in July 3, 1972
C.
at July 3, 1972
D.
in July 3rd, 1972
【单选题】Hi, Tom. When were you born?
A.
I was born in Hangzhou.
B.
What about you?
C.
I was born on June 18th, 2001.
【单选题】—When were you born? —I was born ( ).
A.
in 1988 June 6
B.
in June 6, on 1988
C.
in June 6, 1988
D.
on June 6, 1988
参考解析：
知识点：
题目纠错 0
发布
