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【单选题】
下列关于相对独立的平面坐标系统的说法中,正确的是( )。A.
相对独立的平面坐标系统与国家统的坐标系统不需建立联系
B.
建立相对独立的平面坐标系统是为了保护地方安全
C.
一个城市只能建设一个相对独立的坐标系统
D.
500 万人口以上的城市建立相对独立的平面坐标系统
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【单选题】Big Pig and Little Pig have two possible strategies, Press the Button, and Wait at the trough. If both pigs choose Wait, both get 2. If both pigs press the button then Big Pig gets 7 and Little Pig ge...
A.
Little Pig will get a payoff of 1 and Big Pig will get a payoff of 6.
B.
Little Pig will get a payoff of 3 and Big Pig will get a payoff of 7.
C.
Both pigs will wait at the trough.
D.
The pigs must be using mixed strategies.
【单选题】_________ across the railway, a train hit it.
A.
While walking
B.
Walking slowly
C.
As the little pig walking
D.
While the little pig was walking
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