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问题 单项选择题

毛 * * 说：“你要知道梨子的滋味，你就得变革梨子，亲口吃一吃。”这句话的哲学寓意是（）

A.实践是认识的来源

B.实践是认识发展的动力

C.实践是检验真理的唯一标准

D.实践是认识的目的和归宿

答案

参考答案：A

选择题

如图所示，圆形区域内有垂直于纸面方向的匀强磁场，一束质量和带电量都相同的带电粒子，以不同的速率，沿着相同的方向，对准圆心O射入匀强磁场，并从该磁场中射出．若带电粒子在磁场中只受磁场力的作用，下列说法中正确的是 (   )

A．运动时间较长的，其速率一定较大

B．运动时间较长的，在磁场中通过的路程较长

C．运动时间较长的，在磁场中偏转的角度较大

D．运动时间较长的，射出磁场时侧向偏移量较大
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单项选择题

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A．loop

B．find

C．search

D．query
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