题目

The People’s Republic of China （PRC） is celebrating its 70th founding anniversary this year. Over the past decades（几十年）, many people have made great contributions to the country’s development, helping it grow through their hard work. On Sept.17, ahead of National Day on Oct 1, eight people received the Medal of the Republic （共和国勋章）. Here are four of the eight recipients （接受者） of the Medal of the Republic. Yu Min 于敏, 1926-2019Nuclear physicistOn June 17,1967, China detonated （引爆） its first hydrogen bomb （氢弹）. It took only 32 months t平方厘米、平方分米、平方米都是______单位，都是用来度量物体______的．