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【简答题】
求由摆线 x = a ( t - sin t ) , y = a (1 - cos t ) 的一拱 (0 £ t £ 2 p ) 与横轴所围成的图形的面积 .
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举一反三
【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】The impedance of an RLC series circuit is definitely decreased if:
A.
R decreases
B.
R increases
C.
L increases
D.
C increases
【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】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】Current-series feedback ( ) the output impedance of an op-amp.
A.
increases
B.
decreases
C.
reduces by half
D.
has no effect on
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