单项选择题

What will be achieved by the design of SAX 40

A．The noise SAX-40 made cannot be heard at take off.
B．The noise SAX-40 made cannot be heard during landings.
C．The noise SAX-40 made during landings will decrease sharply.
D．The noise SAX-40 made at takeoff will decrease sharply.
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单项选择题
Which of the following is true according to Paragraph 3
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.
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