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The writer says that he had to pass the philosophy final (Paragraph 5) because ______. Ⅰ. if not, he would have had to attend the college' s summer school Ⅱ. otherwise he would have been able to continue his study in the class Ⅲ. if he had failed the phil
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人机系统常见的事故中，卷入和挤压是造成机械事故的主要原因，其发生的频率最高，约占机械伤害事故的()。
The countermeasures the nation's main air carriers would take to prevent any sharp drop in
A．as opposedB．on the contraryC．as opposed toD．on the objection to
Boeing Plans to make this scenario possible with its broadband telecommunications initiative, Connexion by Boeing. This service will allow fliers to surf the Web, send and receive email, access the company internet, book dinner reservations trade the honest stock, shop-online and watch live TV from any seat in an aircraft.
Connexion is already available on private jets, and Boeing says that the two-way broadband service will be installed on domestic flights in late 2001. Global coverage is slated to arrive by 2005. Subscribers will be able to access Connexion from their seats using laptops or personal digital assistants, plus a network card and a cable provided by the airline. The cost？ Comparable to ground-floor cellular phone service; between $ 6 and $ 25 an hour.
One key enabler for this technology is a phased-array antenna, originally developed by Boeing in 1986. Located on the aircraft's upper fuselage, the antenna electronically transmits beams to a satellite at 1.5 Mb per second and receives them at 5 Mb per second. Thus, every passenger can access Connexion concurrently, securing connection speeds of no less than 56 Kb per second each. The actual bandwidth will be continually upgraded.
Boeing ultimately wants to bring the service to markets like cruise ships and oil exploration plat- forms. Until then, the sky' s the limit.
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