【单选题】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
【单选题】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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