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【单选题】
对于时间信号来说，数字信号和模拟信号的区别是：A.
只有振幅上有区别，数字信号在振幅上离散
B.
数字信号和模拟信号的不同是它在时间和振幅上都离散
C.
没有区别
D.
只有时间上有区别，数字信号在时间上离散
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】以下哪些属于车辆交付的东风雪铁龙时刻
A.
向用户展示旧件
B.
征得用户同意后将保养提示静电贴在前挡玻璃上
C.
当着用户的面取下车辆防护五件套
D.
向用户递送名片，提醒今后有需求可以与我们联系
【单选题】We found it cheaper to _____ existing equipment than to buy new machine.
A.
design
B.
confine
C.
identify
D.
modify
【简答题】某分部工程双代号网络计划如下图所示，其作图错误包括（ ）。
【单选题】Whether such taxes work is a matter of debate. A preliminary review of Mexico's taxation found a fall in purchases of taxed drinks as well as a rise in sales of untaxed and healthier drinks. By contra...
A.
It did not work out as well as was expected.
B.
It gave rise to a lot of problems on the border.
C.
It could not succeed without German cooperation
D.
It met with firm opposition from the food industry
【单选题】To: John Davidson From: Peter Plate Date: April 10 Subject: The Water Quality Conference in Jacksonville Flight.doc(2 KB) Dear Mr. John Davidson, Regarding the trip to the conference in Jacksonville, ...
A.
Arriving a day earlier in Jacksonville
B.
Flying to Destin
C.
Sightseeing in Florida
D.
Booking a flight on the Internet
【单选题】“音乐多了,反失雅致,只用吹笛的远远的吹起来就够了。” ......又入席换暖酒来.正说着闲话,猛不防只听那壁厢桂花树下,呜呜咽咽,悠悠扬扬,吹出笛声来.趁着这明月清风,天空地净,真令人烦心顿解,万虑齐除,都肃然危坐,默默相赏。 这样欣赏音乐是谁的主意?
A.
贾母
B.
贾政
C.
宝玉
D.
王夫人
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