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[主观题]
Robert, there's a man at the front door, saying he has _____news of great importance.
A.the
B.an
C.a
D./
提问人:网友sulynn
发布时间:2022-01-07
A.the
B.an
C.a
D./
Jim is in great need of money, but he has ________ my help. |
[ ] |
A. denied B. assessed C. rejected D. challenged |
A、have been
B、has been
C、are being
D、is
A BJT has measured dc current values of= 0.1 mA and
= 8.0 mA. When IB is varied by 100 μA, IC changes by 10 mA. What is the value of the βac for this device?( ).
A、80
B、10
C、100
D、800
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