问题
多项选择题
家用燃气快速热水器按结构可分为哪些种类。（）
A、容积式
B、室内式
C、快速式
D、悬挂式
答案
参考答案：C, D
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家用燃气快速热水器按结构可分为哪些种类。（）
A、容积式
B、室内式
C、快速式
D、悬挂式
参考答案：C, D
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| Concorde's Birthday CONCORDE, the world's fastest passenger plane, will soon be over 33 years old. It first 1 on 2 March 1969 in France. Concorde was developed by both France and Britain. From 1956 these two countries had a 2 of a supersonic passenger plane. In 1962 they started to 3 together on the project. The plane 4 over 1.5 billion pounds to develop. It is the most tested plane in the history. It was given over 5000 hours of testing. Concorde flies at twice the speed of 5 . This means that it 6 only 3 hours 25 minutes to fly between London and New York, compare with 7-8 hours in other passenger jets. Because of the five-hour time difference between the USA and Britain, it is 7 to travel west on Concorde and arrive in New York before you leave London! You can catch the 10:30 a.m. 8 from London, Heathrow and start work in New York an hour 9 ! Concorde is much used by business people and film stars. Each Concorde is built at a cost of 55 million pounds. Twenty have been built so far. Air France and British Airway 10 the most. They each have seven planes. | ||||
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