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Japans Number Five Travel Company by Takako Makino Sapporo - In its October edition, National Travel Magazine rated the Sapporo-based the Narita Travel Company at number five on its list of Top Ten Travel Companies in Japan for the new year. According to National Travel Magazine, the Narita Travel made the list because it demonstrated a strong commitment to offer tour participants a rewarding and memorable experience. From camping near quiet lakes, climbing mountains, and skiing to walking forest, and dog sledding, Narita Travel has developed fun-filled activities for a variety of outdoor adventures. The owner of Narita Travel, Yoko Sato, was delighted to find out that her company had made the list. In a statement the company released yesterday, she said, 'We are honored to be recognized as one of the preeminent travel companies in the country, alongside the popular companies like Osaka Travel and Tokyo Travel, that have been in the eco adventure business much longer than we have.' Why was the Narita Travel Company selected by National Travel Magazine?A.
It offers more outdoor activities than other travel companies.
B.
It designs trips that participants are likely to remember for a long time.
C.
It is one of the most popular travel companies in the country.
D.
It is more committed to the environment than its competitors.
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【单选题】下列关于雷电破坏性的说法中，错误的是( )。
A.
直击雷具有机械效应、热效应
B.
闪电感应不会在金属管道上产生雷电波
C.
雷电劈裂树木系雷电流使树木中的气体急剧膨胀或水汽化所导致
D.
雷击时电视和通信受到干扰，源于雷击产生的静电场突变和电磁辐射
【多选题】下列有关光电效应的说法正确的是 ( )
A.
光电效应现象证明了光是电磁波
B.
普朗克为了解释光电效应现象 ,提出了光子说
C.
在高于某特定频率的电磁波 照射下，某些物质 内部的电子 会被光子激发出来而形成电流。
D.
入射光的频率低于金属的截止频率时不发生光电效应
【简答题】简述单片机的概念、特点和产生的原因。