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【简答题】
阅读短文,用适当的词填空,使短文意思完整。 There are two main kinds of sports. These two kinds of sports are team sports and individual(个人的) sports. Team sports are such sports as baseball, basketball, and 1 . Team sports 2 two separate (独立的)teams.  The teams play against each other.  They  compete  against  each  other in order to get higher 3 . For example, in a football game, if team A gets 7 points and team B gets 3  points, team A wins the game. Team sports are sometimes 4 competitive sports. Besides(除了)team sports, there is 5 main type, or kind, of sporting activity. That is individual sports. In individual sports there are 6 teams. There isn't any competition. People  play individual  sports  in  order to get exercise.  They don't play individual sports for the competition. 7 , they want to get some exercise,  not to win a game. Individual sports are such sports as swimming, skiing, and 8 . Of course, it is possible to compete  in individual sports.  It  is  possible to  keep  a score in individual sports. The main difference, however, 9 team sports and individual sports is that individual sports can be performed alone. Team sports always need more than 10 person.
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【判断题】变压器空载运行时空载电流较小,又称励磁电流,主要作用是建立磁场。
A.
正确
B.
错误
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总线型网
B.
环型网
C.
星型网
D.
网状网
【单选题】中心结点故障会造成整个系统瘫痪的是
A.
总线型网
B.
环型网
C.
星型网
D.
网状型
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轮齿折断
B.
齿面点蚀
C.
齿面胶合
D.
齿面磨损
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依靠地波传播距离近
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依靠天波传播距离远
C.
存在盲区现象
D.
传播距离取决于收发天线高度
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B.
设备简单轻便,适用于车载,船载,机载的通信。
C.
不受电离层的影响。
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建设和维护的费用较低,基本上一次投资。
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总线型
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环形
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星形
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网状型
【单选题】一般参数的开式齿轮传动,其主要失效形式是()
A.
齿面点蚀
B.
轮齿折断
C.
齿面磨粒磨损
D.
齿面胶合
【单选题】一般开式齿轮传动,其主要失效形式是 。
A.
齿面点蚀
B.
齿面磨粒磨损
C.
齿面塑性变形
D.
齿面胶合
【单选题】一般参数的开式齿轮传动,其主要失效形式是 。
A.
齿面点蚀
B.
齿面磨粒磨损
C.
齿面胶合
D.
齿面塑性变形
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