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【多选题】
以下关于差分放大电路的说法正确的是( )A.
差分放大器由双端输出变为输出，抑制共模信号的能力减弱
B.
差分放大器空载时，由双端输出变为输出，差模电压增益变为双端的一半
C.
差分放大器的差模输入电阻与输入、输出方式无关
D.
差分放大器由双端输出变为输出， 输出电阻减小一半
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【单选题】What is the size of the piece of Telstar Tina expected to strike the earth?
A.
Several ounces.
B.
Large enough to kill the dinosaurs.
C.
Large as a house.
D.
More than one kilogram.
【单选题】— What do you think of the concert given by the young pianist? — Excellent, ______ one piece of the music wasn't played quite well. [ ]
A.
and
B.
though
C.
because
D.
so that
【单选题】下列物质中，酸性由强到弱错误的是
A.
HClO 4 H 2 SO 4 H 3 PO 4 HSiO 4
B.
HClO 4 HClO 3 HClO 2 HClO
C.
H 2 SO 4 H 2 SO 3 HNO 3 HNO 2
D.
HClO 4 H 2 SO 4 H 2 SO 3 H 2 CO 3
【单选题】HClO, HClO3 , HClO4 酸性大小排列顺序是:
A.
HClO > HClO3 > HClO4
B.
HClO > HClO4 > HClO3
C.
HClO4 > HClO > HClO3
D.
HClO4 >HClO3 >HClO
【单选题】What are they doing?
A.
They are listening to a piece of music.
B.
They are writing a book about the moon.
C.
They are studying the life of Beethoven.
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