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搜题
【判断题】
数字通信系统的信源一定是数字信源。A.
正确
B.
错误
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】色谱法定量分析时采用内标法的优点是( )。
A.
可以缩短分析时间
B.
消除和减轻拖尾因子
C.
内标物易寻找
D.
消除仪器、操作等影响，优化测定的精密度
E.
优化共存组分的分离效果
【单选题】What happened to the trendy French radio journalist, Albert Dufort, according to the passage?
A.
He was recognized as a famous reporter after the historical move of immigrants.
B.
He was killed for some unknown reason.
C.
He believed that he was also an immigrant from India.
D.
Tens of thousands of students travel south to greet him.
【单选题】哪个快捷键可以填充前景色?
A.
· . Alt+Backspace（退格）（delete）
B.
· Ctrl+Backspace （退格）（delete）
C.
· Shift+Backspace （退格）（delete）
D.
· Alt+Shift
【单选题】According to the first paragraph, what happened to the waters off southern Greenland and Iceland in the last 30 years?
A.
The waters are salty.
B.
The waters are not very salty.
C.
The salinity is decreasing.
D.
The sea water is becoming less and less.
【简答题】What happened to the New York Knicks in the 1980s?
【单选题】Finally, what happened to the song 'Good Morning to All' after the addition of the second verse?
A.
It was even more popular than before．
B.
I t was no longer sung by the children in kindergarten．
C.
The composers，Mildred and Patty, gave up their rights to own the song．
D.
It was gradually replaced by the addition, having a new name 'Happy Birthday to You'．
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