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  3. What will be achieved by the design of SAX 40? Which of the following is true according to Paragraph 3?

What will be achieved by the design of SAX 40? Which of the following is true according to Paragraph 3?

admin2009-04-23  23
问题 What will be achieved by the design of SAX 40?
Which of the following is true according to Paragraph 3?
选项 A、The size of the exhaust nozzles is adjustable.
B、The acoustic liners in the exhaust will save fuel.
C、Flaps are devices that brake the airplane.
D、Turbines with three radial-blade fans will reduce non-moving parts.
答案A
解析 第三段主要讲的是静音所要改进的方方面面。根据本段第二句的后半句可知排气装置管口的大小是可调节的，起飞的时候变小可以减少噪音，而飞行的时候变大可以有效地利用燃料。根据本段第一句可知长排气装置管中的吸声衬垫是为了消除噪音，不是为了节省燃料，故排除 B；根据本段第三句可知“instead of noisy flaps”不是用飞机的副翼制动而是一个倾斜的机翼和大幅的倾斜角度，故排除C；根据本段最后一句可知细致调整好的涡轮叶片不会使不动的部分震动，而不是说它能减少不动的部分，故排除D。
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