皮皮学，免费搜题
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搜题
【判断题】
开环控制系统就是有反馈信号的控制系统，其精度比较高A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I think the Beijing Olympic will develop our ________with many countries.
A.
enjoyment
B.
success
C.
interests
D.
friendship
【简答题】Their refusal to sign the international treaty was __________ by many countries in the world. [A] announced [B] denounced [C] renounced [D] pronounced
【单选题】Ubuntu Server图形化界面,安装桌面软件的命令是
A.
sudo apt-get install Ubuntu
B.
sudo apt-get install desktop
C.
sudo apt-get install Ubuntu-desktop
D.
sudo apt-get install desktop-Ubuntu
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