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【单选题】
要使TTL与非门工作在转折区,可使输入端对地外接电阻R I 。A.
＞R ON
B.
＜R OFF
C.
R OFF ＜R I ＜R O
D.
＞R OFF
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【简答题】接触器选用时,主触点的额定工作电流应 或_ 负载电路的电流,吸引线圈的额定电压应与控制回路 。
【单选题】By the year 2000, today's______ nations will have a total population of 5 billion people, nearly four-fifths of the world's population.
A.
biggest
B.
Asian
C.
developing
D.
developed
【单选题】—______ is the population of China today? —It's about one billion, three hundred million. [ ]
A.
How many
B.
How much
C.
What
【单选题】By the year 2000, today's ______ nations will have a total population of 5 billion people, nearly four fifth of the world's population.
A.
biggest
B.
Asian
C.
developing
D.
developed
【简答题】企业利用互联网面向个人消费者开设网店,这种电子商务模式是
【简答题】Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food. One way to produce more food is growing st...
【单选题】China today is home to 13 billion people--nearly one quarter of the world's population. The growth of China's population is largely the result of modernization, which has brought with it more food, be...
A.
predict the population problem in China
B.
explain why the family-planning policy is adopted in China
C.
illustrate the result of family-planning policy
D.
demonstrate the cause and effect of the family-planning policy
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