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【判断题】
( )132.外设接口是PLC实现人机对话和机机对话的通道。A.
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B.
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【简答题】Visiting a city you have never been before can be a fun. Finding out informations about the city before you go can make the trip more interested! Most cities have a travel office from that you can get...
【单选题】Read the following paragraph from the section "Thick Ice, Strong Wind." Everyone who visits there must have training. They learn about the danger. They must follow safety rules to survive. What is the...
A.
what scientists study in Antarctica
B.
when scientists go to Antarctica
C.
why scientists train to go to Antarctica
D.
how many scientists are in Antarctica
【简答题】Robert Swan has taken more than 1________ business people and students to Antarctica so that they could experience the place for themselves. During these visits, they removed 2________ tons of old was...
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