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【单选题】
一个AM广播电台播放的音乐信号的最高频率分量为10kHz，该电台采用双边带幅度调制，载波的频率是800kHz，则已调信号的下截频和上截频分别为( )A.
790kHz ， 810kHz
B.
790kHz ， 800kHz
C.
800kHz ， 810kHz
D.
800kHz ， 820kHz
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
【单选题】幻灯片母版是模板的一部分,它存储的信息不包括( )。
A.
文本内容
B.
背景图片的设置和填充、配色方案
C.
文本和对象占位符的大小
D.
文本和对象在幻灯片上的放置位置
【单选题】患儿女,生后7天,近日来,皮肤、巩膜黄染明显,来医院就诊,查体:T36.8°C,P132次/分,R24次/分,精神、食欲及大小便均正常。其黄疸可能是
A.
病理性黄疸
B.
生理性黄疸
C.
胆道闭锁
D.
新生儿脐炎
E.
新生儿败血症
【简答题】He wasn't able to answer all the questions, so he didn't pass the examination.
【简答题】比较下列化合物酸性强弱:( )>( ) >( ) 。 C;B;A;
【简答题】Speaking of
American table tanners, here are some tips for you: ( )A. Chew with your mouth closed. B. Say "Excuse me," or "Excuse me, I'll be right back," before leaving the table. C. Burping, coughin...
【单选题】He wasn't able to _____the stress of the job.
A.
manage with
B.
handle with
C.
deal with
D.
cope
【单选题】He wasn't able to____the stresses of the job.
A.
manage with
B.
handle with
C.
cope with
D.
deal
【判断题】With American table manners, you hold the folk in your right hand and the knife in your left hand.
A.
正确
B.
错误
【简答题】Please read Text B of Unit 2 carefully and portray the sharp contrast in American people with the help of Summary table from Powerpoint.
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