皮皮学，免费搜题
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搜题
【判断题】
Inner Packing是小包装。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：
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皮皮学刷刷变学霸
举一反三
【单选题】What are the functions of PSAs?
A.
PSAs can automatically monitor life support systems, snapping photos, and taking overmonitoring tasks from failed sensors.
B.
They are capable of videoconferencing so that they offer a virtual presence of ground crows and scientists.
C.
They can go where no man has gone since the vehicles were first assembled.
D.
All of the above mentioned.
【简答题】根据反馈信号与输入信号在放大电路输入端的连接方式不同,反馈可以分为()和()。