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【单选题】
交换机收到数据帧的帧头后，根据帧头的目的MAC地址立即转发帧，这种转发模式称之为( )转发模式。A.
Cut-through
B.
Store-and-Forward
C.
Fragment-free
D.
Store-free
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【单选题】'High tech' and 'state of the art' are two expressions that describe very modern technology. High tech is just a shorter way of saying high technology. And high technology describes any invention, sys...
A.
To tell how 'high tech' and 'state of the art' have developed.
B.
To give examples of 'high tech'.
C.
To tell what 'high tech' and 'state of the art' are.
D.
To describe very modern technology.
【单选题】下列关于质点的说法中正确的是 ( )
A.
凡轻小的物体皆可看作质点
B.
只有体积很小的物体才能看作质点
C.
研究地球绕太阳公转时可将地球看作质点
D.
研究某学生骑车姿势的变化时可以把学生和车看作质点
【简答题】(P56杨胜乾)农民以出售原材料为主,____、____蔬菜、禽畜直接成为旅游接待的商品。
【单选题】'High tech' and 'state of the art' are two expressions that describe very modern technology. High tech is just a shorter way of saying high technology. And high technology describes any invention, sys...
A.
To tell how 'high tech' and 'state of the art' have developed.
B.
To give examples of 'high tech'.
C.
To tell what 'high tech' and 'state of the' are.
D.
To describe very modern technology.
【单选题】关于质点，下列说法正确的是（）
A.
只有质量和体积很小的物体才能被视为质点
B.
只要物体的运动不是很快，就可把它视为质点
C.
研究地球绕太阳公转的时间，可将地球视为质点
D.
研究子弹射穿一张薄纸所需的时间，可以将子弹看作质点
【简答题】阅读理解。 Technology is the application(应用) of knowledge to production. Thanks to modern technology, we have been able to increase greatly the efficiency of our work force. New machines and new methods ha...
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