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问题 选择题

属于全球定位系统空间部分的是

A．GPS卫星星座  B．地面监控系统  C．GPS信号接收机  D雷达

答案

答案：A

三大部分：空间部分—GPS卫星星座；地面控制部分—地面监控系统；用户设备部分—GPS信号接收机。所以本题选择A选项。

单项选择题

Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal ______ . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load ______ can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the ______ across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ______.

A. balancing B. uploadingC. downloading D. transmitting
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单项选择题

电话订票的有效证件叙述不完全正确的是（）。

A、港澳居民来往内地通行证

B、中华人民共和国居民身份证

C、护照

D、台湾居民来往大陆通行证
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