单项选择题

The stress man's job is to______.

A．test how safe the plane is
B．calculate how strong each part must be
C．work out what height the plane may fly at
D．control the amount of luggage each passenger may carry

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热门试题

单项选择题

The maximum possible weight of an aircraft is determined by______.

A．the engine power
B．the amount of freight room
C．the number of passengers
D．international regulations

单项选择题

The first three aeroplanes of a new type______.

A．are only for show
B．are all destroyed
C．are later broken up for spare parts
D．are used for testing purposes