URL：https://www.researchgate.net/publication/364255786/figure/fig2/AS:11431281088701985@1665231790905/IMO-regulations-for-the-four-levels-of-MASS-20.ppm
掲載元：https://www.researchgate.net/figure/IMO-regulations-for-the-four-levels-of-MASS-20_fig2_364255786
