题目内容

某站点在交流停电时，需要由油机发电组供电。油机供电对象耗电量如下：通信设备耗电折合有功功率85KW，空调耗电25KW，机房照明及检修用电5KW，所有办公电脑用电10KW,所有耗电以三相功率计，各设备功率因数取0.8，请计算油机配电屏容量。

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某IDC机房处于800米海拔城市，所有服务器用三相交流电达到最大功耗时消耗有功功率为30KW，功率因数为0.85，如果采用UPS供电，应购买以下哪种容量等级的UPS？应配置多少台UPS？（可选UPS容量等级有15KVA、35KVA、50KVA 65KVA、80KVA）UPS交流输出相线截面积计算值应为多少mm2?

网络中间件完成无线传感器、、、等。

物联网、泛在网、传感网等概念基本没有交集。( )

A. 对
B. 错

Section A Text summaryThrough long-term comparisons of grades as well as of commitment to school between working and non-working students, the research finds that the students who worked 20 hours or more weekly had lower scores, cut class more often, and became less ____ to school. Besides, more students are more likely to work longer hours, and _. But once they withdraw from work or on their work hours, their commitment to school is renewed.The research comes up with some contributors to such effects. For one thing, working students have less time to devote to school. So they _ by taking easier classes or refusing to do homework. For another, working students are too tired from work to focus their minds on study. And worst of all, their interest in study is bit by bit, their desire to earn big money grows stronger and stronger, thus enabling them to turn to so much drugs and alcohol for recreation as to speed up their ____ from school.To reverse the trend, the author makes it clear that students should _ to work no more than 10 hours per week if they want to reap success from school. And above all, as the author points out, it’s time to ____ the myth that the great value of work takes form in our formative years.