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【简答题】
负反馈放大电路中,若反馈信号与输入信号以电流方式进行比较,则引入的是#tk#反馈。
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】汉代画家最有名的是西汉的( ),擅画人形,丑好老少很逼真,相传他故意把( )画得平常,最终导致汉元帝把她远嫁匈奴。
【单选题】According to the writer, why don't students travel?
A.
a They are too focused on their studies
B.
b They think that traveling is too expensive for them
C.
c Their parents don't allow it
【简答题】下列关于仲裁开庭的说法正确的是（ ）。
【单选题】According to the writer ,why don't students travel?
A.
they are too focused on their studies.
B.
they think that traveling is too expensive for them
C.
their parents don't allow iit