香港閱讀城 - Smart Mathematicians Lower Primary-13 Don't Be Late
Smart Mathematicians Lower Primary-13 Don't Be Late
出版日期:
03/2017
叢書:
Smart Mathematicians
The first electric traffic signal was installed on 5 August 1914 in the city of Cleveland, USA. It had to be operated by a police officer inside a booth. How many years are there between 1868 and 1914?
版面:
固定
關鍵字詞:
數學
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