nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><span style="font-size: 12pt">各港口可供应的货物。当然，每种货物不可能到处都买的到，否则就用不着船队了。因此，规定每种货物最多只有</span><span style="font-size: 12pt">20</span><span style="font-size: 12pt">个的港口供应。</span></div>
<div style="text-justify: inter-ideograph; text-indent: 1cm; line-height: 20pt; text-align: justify"><span style="font-size: 12pt">3．<span style="font: 7pt 'Times