<p>以下程序的输出结果是：( )<br/> ls =list({'shandong':200, 'hebei':300, 'beijing':400})<br/> print(ls)</p>
<p> ['300','200','400']</p>
<p> ['shandong', 'hebei', 'beijing']</p>
<p> [300,200,400]</p>
<p> 'shandong', 'hebei', 'beijing'</p>
