【单选题】Which feature,when set to zero,might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability?
B.
Selective Availability
【简答题】有一机修车间,拥有冷加工机床52台,共200kW;点焊机3台,共10. 5kW(ε=65%)。车间采用220/380V供电。试确定车间的计算负荷 P c 、Q c 、S c 和I c 。相关数据如下表。(同时系数取 0.9 ) 序 号 设备名称 设备 台数 需要 系数 Kd cos φ tan φ 1 冷加工机床 52 0.2 0.5 1 . 73 2 点焊机 3 0.35 0.6 1 . 33
【简答题】有一机修车间,拥有冷加工机床52台、共200kW;行车1台、共5.1kW(ε N =15%);通风机2台、共5kW;点焊机3台、共10.5kW(ε N =65%)。车间采用220/380V三相四线制(TN-C系统)供电。试确定车间的计算负荷P 30 、Q 30 、S 30 和I 30
【单选题】语文老师请李林朗读“你能借给我吗?我只借这一件。”这句话,你认为重音处理最恰当的一项是( )
【简答题】阅读表达。 阅读下面的短文, 并根据短文后的要求答题. ( 请注意问题后的词数要求 ) If you are a male and you are reading this,congratulations:you are a survivor. According to statistics, you are more than twice as likely to die of skin c...
【简答题】阅读表达。 阅读下面的短文,并根据短文后面的要求答题.(请注意 问题后的词数要求) Have one of those days or weeks when everything seems to annoy you? Even if you do nothing about it,your bad mood will probably go away after some time. But w...
【简答题】(任务型阅读) 阅读下面的短文,并根据短文后的要求答题(请注意问题后的字数要求)。 Safety in the highway is not totally out of hands. Here are four ways we can protect ourselves when we travel. You are safer in a large car. People in small c...