相关知识点: 试题来源: 解析 1.Garrett Morgan invented the modern traffic signal. 2.his determination 3.The traffic signal didn’t have a “warning” signal. 4.It had to be operated by hand/manually. 5.A car. 反馈 收藏
What year did Garrett Morgan invent the traffic light? What year did James Watt invent the linkage? What year did Philo Farnsworth invent the television? What year did Robert Millikan make his discovery? At what age did Alexander Graham Bell invent the telephone?
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How old was Philo Farnsworth when he invented the TV? What was Richard Arkwright famous for? What year did Garrett Morgan invent the hair straightener? During what years did Samuel de Champlain explore? What year did Jacques Cartier discover the St. Lawrence River?