2ÔÂ20ÈÕ£¬ºÓÄÏÐÂÏç´ó¶¹¼Û¸ñ½Ï´º½ÚÇ°»ù±¾Îȶ¨£¬ÖпÅÁ£´ó¶¹2.57Ôª/½ï£¬¸ßµ°°×´ó¿ÅÁ£¾»Á¸×°³µ2.70Ôª/½ï£¬¸ÃµØÓàÁ¸Ä¿Ç°Ô¤¼Æ4³É×óÓÒ¡£