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【简答题】
某电影院共有20排座位．已知第一排有18座，后面每排都比前一排多2个座位． （1）写出计算第n排的座位数a n （2）当n=20时，求a n ．
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举一反三
【单选题】an electronic machine that can store and deal with large amounts of information.
A.
computer
B.
paper shredder
C.
bill counter
D.
stapler
【简答题】We request you cover a warehouse ______ warehouse insurance for 500000 Yuan ______ large electronic computers ______ transit from our warehouse to New York port.
【单选题】Electronic animals are very popular in China's large cities because ______.
A.
it is small in size and easy to take care of
B.
it can eat and feel like real animals
C.
it can in a way satisfy animal lovers
D.
it is invented in Japan
【单选题】The first electronic computer in 1945 was so bulky that it filled a large room and weighed 30 tons.
A.
large and heavy
B.
complicated and rough
C.
powerful and strong
D.
heavy and powerful
【简答题】Large electronic items (e.g. a laptop) have to be removed from __________ and _________.
【单选题】The world's first large electronic computer (1946) ______.
A.
was built after the World War Ⅱ
B.
was used for over 10 years
C.
contained 25000 valves
D.
could perform only 10000 calculations per second
【简答题】CD工法和CRD工法的主要区别是:CD工法( ),CRD工法( )。
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