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问题 选择题

实行计划生育以来，我国每年净增人口数量仍在一千万以上，其最主要的原因是（ ）

A．人口死亡率低

B．人口出生率高

C．人口基数大

D．人口自然增长率高

答案

答案：C

题目分析：由于我国人口基数大，所以每年净增人口数量仍在一千万以上。

问答题 简答题

石阡有名的土特产有哪些？
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单项选择题

Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support uni-directional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by (66) IP addresses. The IP addresses must be (67) . These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software (68) for each application that uses (69) channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with (70) IP addresses.

A．routable

B．locatable

C．path-selected

D．road-defined
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