A.John Augustus Roebling fell ill. B.Misfortune fell on the chief engineer. C.The chief engineer was in short of money. D.Washington Roebfing met with an accident.
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举一反三
【单选题】The sailor presses the pushbutton, the lifeboat will be lifted downward, when he releases the pushbutton, the lifeboat will stop.
【单选题】The operator presses the “start” pushbutton, the “stop” pushbutton will disconnect. When he presses the “stop” pushbutton, the “start” pushbutton will disconnect.