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【单选题】
广域网由于传输距离较远，通常要借助于公共传输网。公共传输网络的主要技术有A.
分组交换和信元交换
B.
分组交换和电路交换
C.
信元交换和电路交换
D.
多层交换和分组交换
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举一反三
【简答题】Listen to a news report about beauty. Match each scientist or group of scientists with the correct research results.
【简答题】A new coronavirus, a cousin of the SARS virus, has infected more than 10,000 people since the outbreak began in Wuhan, China, in December. Scientist Leo Poon, who first decoded the virus, thinks it li...
【单选题】These eggs were found in the Gobi Desert by a group of scientist ________. [ ]
A.
in the 1920
B.
in the 1920s
C.
in 1920s
D.
in 1920s'
【简答题】Tu up for prestigious award Chinese scientist Tu Youyou, winner of the 2015 ______ for the discovery of artemisinin, a group of drugs used to combat malaria, has been ______ for China's Medal of the R...
【简答题】各类毛细血管通透性由大到小,依次是_______,________,_________.
【单选题】Reading in DepthPassage 1Why do we cry? Crying makes sense if smoke gets in your eyes or if you’re cutting onions. The tears protect your vision. But what good is emotional crying?Crying often seems t...
A.
cutting onions
B.
sad movies
C.
the body’s chemistry
D.
difference between men and women
【简答题】Recently, a scientist did some experiments．He left a group of 4-year-olds in a room with a bell and a candy．If they rang the bell, he would come back and they could eat the candy．If, however, they did...
【简答题】Why do we cry? Crying makes sense if smoke gets in your eyes or if you’re cutting onions. The tears protect your vision. But what good is emotional crying? Crying often seems to make people feel bette...
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