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问题 单项选择题

（十三）气候异常是当今人类面临的重大环境问题，它严重威胁与影响人类的生存和生活。

今年4月，太平洋周边某些国家出现异常高温干旱天气，有专家认为这与厄尔尼诺有关。根据厄尔尼诺影响的一般规律判断，发生干旱的国家可能是（）。

A.日本

B.泰国

C.智利

D.秘鲁

答案

参考答案：B

解答题
在△ABC中，角A，B，C的对边分别为a，b，c．已知2cos(A+B)+cos2C=-
3
2
，c=
39
，且a+b=9．
（Ⅰ）求角C的大小；
（Ⅱ）求△ABC的面积．
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单项选择题

astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost (141) . For example, the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (142) . Hence, additional maintenance procedures must be maintained and administrative records are (143) . The duplication of transport facilities to carry (144) network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space and an increase in power connections and power consumption, migration of these (145) network elements to IP-based DCns is alogical strategy.

A．declined

B．proliferated

C．destroyed

D．produced
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