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【判断题】
二极管的质量抽检中，二极管1N4001为 整流 二极管，鸭测得此二极管两端正反向电压均为无穷大 ，说明二极管已经 损坏 。A.
正确
B.
错误
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【单选题】I was very disappointed not to be able to go to the jazz concert last Friday. The advertisement in the paper said that you could buy tickets at the theatre box in Richland Hills any day between 10:00 ...
A.
over the radio
B.
from one of his workmates
C.
from the newspaper
D.
from his friends
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