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【单选题】
Almost every family buys at least one copy of a newspaper every day, Some people subscribe to as many as two or three different newspapers. But why do people read newspapers? Five hundred years ago, news of important happenings--battles lost and won, kings or rulers overthrown or killed--took months and even years to travel from one country to another. The news passed by word of mouth and was never accurate. Today we can read in our newspapers of important e vents that occur in faraway countries on the same day they happen. Apart from supplying news from all over the world, newspapers give us a lot of other useful in formation. There are weather reports, radio, television and film guides, book reviews, stories, and, of course, advertisements. There are all sorts of advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for their advertising space, but it is worth the money, for news of their products goes into almost every home in the country. For those who produce newspapers, advertisements are also important. Money earned from advertisements makes it possible for them to sell their newspapers at a low price and still make a profit. The habit of reading newspapers is ______.
A.
widespread
B.
found among a few families
C.
not popular
D.
uncommon
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参考答案:
举一反三
【简答题】(10分)图2所示电路中, R为何值时可获得最大功率,其最大功率值为多少?
【单选题】图示电路中, 获得最大功率时,其值为( )。
A.
B.
Ω
C.
Ω
D.
【简答题】合理运输的五要素是什么?
【简答题】图9.1 5所示电路中,当R=1Ω时,U=7.5V;当R=2Ω时,U12V。求R为何值时它可以获得最大功率,其最大功率Pmax为多少?
【简答题】决定合理运输的五要素是什么?
【单选题】图示电路中, 获得最大功率时,其值为( )。
A.
B.
2/3Ω
C.
3/2Ω
D.
【单选题】CRH1受电弓工作高度最高为( )。
A.
6 500 mm
B.
6 600 mm
C.
6 700 mm
D.
6 800 mm
【判断题】紫丁香、白蜡树、女贞及连翘都属于木犀科植物。( )
A.
正确
B.
错误
【简答题】如图13.6.2所示电路中,当R=1Ω时,U=7.5V;当R=2Ω时,U=12V。求R为何值时它可以获得最大功率,其最大功率P max 为多少?
【单选题】CRH1受电弓工作高度最高为()。
A.
6600mm
B.
6500mm
C.
6800mm
D.
6700mm
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