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【单选题】
在下图所示的电路中,稳压二极管Dz1和Dz2的稳定电压分别为5V和7V,其正向压降可忽略不计,则U0为( )A.
5V
B.
7V
C.
0V
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举一反三
【判断题】“Pipe in mouth” in the sentence “The old man stood under a big tree, pipe in mouth” can also be in the form of “with a pipe in his mouth”.
A.
正确
B.
错误
【简答题】Mouth -to -mouth resuscitation must not be stopped for more than ______ in s, until the victim is breathing on his own.
【简答题】Task Listen to the news report. At the end of news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. Choose the best answer.
【简答题】He was sitting in ____ chair, pipe in ____ mouth.
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