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【单选题】
一双电源互补对称电路如图所示,设已知 = 12 V, = 12Ω, 为正弦波,在BJT的饱和压降 可以忽略不计的条件下,每个管子允许的管耗 至少()WA.
0.9
B.
1.2
C.
0.82
D.
1.64
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【简答题】在( )里填>、<或= 当x=14.2时,x-7.2( )6
【简答题】A．shadows B．shades C．shakes D．shapes
【简答题】A.appearances B.forms C.models D.shapes
【单选题】How do the shapes change by the end of the story?
A.
They decide to move to a different island.
B.
They learn to work together and get along.
C.
They dislike the other shapes even more.
【单选题】Without the artist's work, the public might not ______ .
A.
notice particular shapes and colors
B.
see the shapes and colors that express his experience
C.
feel his delight in shapes and colors
D.
all of the above
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