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【单选题】
听力原文：W：Would you like a cup of tea? M：No，thanks．But I like some coffee, please. Q：What would the man like to have? (7)A.
Tea.
B.
Water.
C.
Nothing.
D.
Coffee.
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举一反三
【简答题】胆固醇生物合成的原料是______。
【单选题】Voltage-series feedback ( ) the output impedance of an op-amp.
A.
increases
B.
decreases
C.
reduces by half
D.
has no effect on
【单选题】Current-series feedback ( ) the input impedance of an op-amp.
A.
increases
B.
decreases
C.
reduces by half
D.
has no effect on
【单选题】Voltage-series negative feedback ( ) the input impedance of an op-amp.
A.
increases
B.
decreases
C.
reduces by half
D.
has no effect on
【单选题】The input impedance of the base of an emitter follower is usually______
A.
high.
B.
shorted to ground.
【单选题】Voltage-series feedback ( ) the input impedance of an op-amp.
A.
increases
B.
decreases
C.
reduces by half
D.
has no effect on
【单选题】胆固醇生物合成的原料是( )
A.
乙酰辅酶A和CO2
B.
乙酰辅酶A和NADPH+H+
C.
NADPH+H+和CO2
D.
乙酰辅酶A和NADH+H+
E.
NADH+H+和CO2
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