皮皮学，免费搜题
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【单选题】
用输出反馈至状态微分前可任意配置极点的充要条件是系统是？A.
能控的
B.
能观测的
C.
稳定的
D.
鲁棒的
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】He is not much of a talker; a ______ sentence for him is "Urn", his standard reply to most questions. (long)
【单选题】George Bernard Shaw's reply to this question shows ______.
A.
he is cheerful
B.
he is capable
C.
he is humorous
D.
he is polite
【单选题】When he was asked how many letters he received yesterday, his reply was_______.
A.
No one
B.
None
C.
Nothing
D.
Not many ones
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