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【多选题】
以下属于模拟信号到模拟信号转换的技术有( )。A.
FM
B.
FDM
C.
CDM
D.
AM
手机使用
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新浪微博
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反馈参考答案：
举一反三
【单选题】--I’ve got a headache again! ---Sorry to hear that. Walk to work every day and you’ll soon back in ______.
A.
situation
B.
condition
C.
position
D.
attention
【简答题】边际报酬递减规律成立的原因是：可变要素和固定要素间有一个最佳比例关系。( )
【单选题】—What do you think of the four classics(名著) of China? —I hear they are wonderful, but I’ve read _____ of them.
A.
all
B.
both
C.
neither
D.
none
【单选题】－What do you think of the four classics (名著)of China? －I hear that they are wonderful, but I’ve read _______ of them.
A.
all
B.
both
C.
neither
D.
none
【简答题】I’ve ________ (刚刚) known about it. Sorry to hear that.
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