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投影面垂直面有哪些?
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空间两直线相互平行,其投影也必然____。
三视图间的投影规律为____、高平齐、宽相等。
在俯、左视图中,远离主视图的那一边反映物体的后面。
Passage 2[音频]Around the world smart cities are being built while those we have lived in for centuries are being upgraded for the future. A smart city may mean one that uses data on traffic to ease congestion or one that aims to 1) _____ services to provided better information for citizens. For many it is about making cities greener and more efficient. It is partly a 2) _____ to overcrowding and pollution and partly because in an ever-connected world it 3) _____ to hook entire cities up to the network.Masdar is a city that stands in the middle of the dessert of Abu Dhabi in the United Arab Emirates. It is designed to be one of the most 4) _____ cities on the planet. With a solar power station at its heart and wind farms providing energy for it, it 5)_____ to be carbon free. Everything in the city, from water to rubbish, is measured and 6) ______, becoming a source of information. The city is built on a raised platform to allow its “digital plumbers” easy 7) _____ the system of advanced technologies that run it. It is pedestrian-friendly and entirely car free. The city is 8) ______ a network of electric driverless podcars. The PRT-personal rapid transit-will run six meters under street level across the city. The buildings in the city have been designed by Norman Foster’s architecture firm, which designed a number of 9) ______ buildings including The City Hall in London.It is hoped that 40,000 people will eventually live in the city, with up to 50,000 10) ______there each day.
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