题目内容
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A) Engineering Materials Technology
B) Materials Engineering
C) Materials Science
D) Materials ScienceAnd Engineering
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B、High-Quality Surface Finish
C、Consistent Properties
D、Low Cost
Megaplane (巨型飞机 )
The Boeing Corp and Europe&39;s Airbus consortium are preparing to offer bigger airplanes to the world&39;s airlines. Now that talks on a joint project have broken down, Boeing is pushing a stretched version of the 747, and Airbus is designing an all new aircraft, known as the A3 × ×.
Seating 550 passengers in the basic model, and 650 in a stretched version, the 1.2 million pound A3 × × will not only be the largest airplane in the world, but it will also be one of the most advanced. The outer wings and the horizontal stabilizer (as big as a smaller jet&39;s wing ) will be made of carbon-fiber composite materials, and will be the largest such structures on any aircraft except the B-2 stealth bomber. Metal skins will be welded together with lasers, removing thousands of fasteners.
When a strong wind strikes the A3× ×&39;s 260-foot wing, movable control surfaces will prevent it from flexing like a giant spring. This will make the ride smoother and will save weight by reducing the load on the wing spars. A flexible-skinned flap will subtly change the wing&39;s curvature to match the airplane&39;s changing weight as it bums fuel on each journey.
The A3 × × will carry up to 1,600 meals, filling more than 100 food and beverage cans. To make more room for passengers, Airbus plans to put the carts in the lower hold ; automatic conveyors and eleva-tors will deliver them to the two passenger decks. Airlines have asked Airbus to look at extra features ran-ging from lower-deck sleeper cabins to a children&39;s playroom.
Airbus expects to offer the A3 × × to airlines in 1998, and deliver the first aircraft in 2003.
The basic model of A3 × × can carry more than 500 passengers. 查看材料
A.Right
B.Wrong
C.Not mentioned
A) Stronger at high temperatures than at low temperature.
B) Easy oxidation at high temperature
C) High specific strength
D) Good resistance to thermal shock.
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